Author Topic: Texas Barn Find - 1974 CB750K4 - HELP ME OUT!!!  (Read 16589 times)

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Offline Funkenstein

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Texas Barn Find - 1974 CB750K4 - HELP ME OUT!!!
« on: September 15, 2015, 10:53:19 AM »
Howdy Everyone!

I just inherited a bike that is just blowing my mind with how cool it is. Follow along with the pictures and I'll tell you the story of the bike as I know it. I want to restore this beautiful bike using minimal intervention and keeping as much of the stock components as possible and I'd like your help!! I'll be posting the rebuild process here on the forum and soliciting tons of advice. I've done some work on all my cars including transmissions, suspension and regular maintenance but I've never opened an engine before. Wish me luck!!

About a year ago, I attended the funeral of my girlfriend's aunt's sister(it gets more convoluted from here so hang on.) She lived on a farm in central Texas with a small pond, some pasture and a little steel barn. I never met her but she seemed like a good country girl judging from the Waylon and Willie framed poster in her living room. My girlfriend's Aunt and Uncle inherited the property and it's contents. After we scattered her ashes in the pond on the farm, the Uncle says he's got something to show me. He says there's an old motorcycle in the back stall of the barn and would I take a look at it. The barn smells like fresh hay and dust which I took as a good sign. No manure!

We walk to the back stall and I see a large indistinct mass under an old painters tarp laying on the ground. Crap, it's laying on it's side! "How long has it been like this?" I ask. "On it's side? I dunno. The bike's been in here since the '70's." he says. My heart starts to get that adrenaline rush as I pull the tarp away. If you're unfamiliar with the words "Mud Dauber" or "Mud Dauber's Nest" they're terrifying looking wasps with foot long stingers that build mud nests 3 feet high. Everything's bigger in Texas!! Haha!  We got her back on her feet and rolled her out in to the light for the first time in forty years!

Well the Uncle crushes me at this point by saying he's promised it to his nephew. Oh well "Cool bike!" I say as I'm applying salve to my wasp stings (Just kidding, mud daubers aren't aggressive.) Fast forward a year and, long story-short(too late!!), the nephew is too busy for a project, would I like it? "Yahooo!!!" I yelled and raced there this past weekend to pick up this little gem. I hadn't really gone over it too much when I first saw it a year ago but apparently it went back under the tarp and stayed parked in the barn where brand new mud daubers setup a few brand new nests. When I get there and take off the tarp for the second time, I'm absolutely floored. There's spiderwebs covering it and 40 years of dust but behold that beautiful odometer!

Immediately I'm wondering "Is that 955 miles or 100,995miles???" I'm freaking out a little bit cause things like this don't happen everyday. A true barn find bike that's been parked for 40 years and only has 955 miles on it?!?! Are you kidding me??? So I starting going over the bike. It's dirty AF, but some spit on my thumb shows me the paint looks pretty freaking good. Orange sunrise flake or something? I should learn that! haha! Well the rest of the bike looks old and filthy to my untrained eyes. Is there any good information in this photo??

It has a huge white fairing and white fiberglass saddlebags so I decide to open them open. After clearing out a mud dauber nest the size of my head, I'm delighted by a literal time capsule of goodies. The left saddle bag has just two items. The original tag and the original inspection sticker which is on a funny little tube.

The last time it was inspected was 1975 and the tag expired in 1977! Holy #$%*e!! This thing might be legit! Well if you think that's cool, wait til you see the contents of the other bag.

Original Toolbag? Check! Original front turn signals? Check! Mud daubers nests? Check! The original felt is still lining the bag! Well the biggest treat is just barely poking out of the picture above. I present to you the original owner's mileage logbook.

The first page says "1974 HONDA CB750 - Picked up 1-29-74"

There are some gasoline credit card carbons tucked into the next page, the only page with writing on it in the whole book. Just take a look for yourself. Run the numbers. I was in shock!

This cool cat only rode this bike 12 times. 12 times!!! For a combined total of 932.9 miles!! The current odometer says 955 and almost 7/10 so only an additional 23 miles was put on the bike before she was put into that barn. I guess you could argue that someone put 100,023 on it before it was stored but c'mon! The story I heard was that the original owner had a close call somewhere around that last ride (those missing 23 miles??) and swore to never ride it again. He gave it to his son who was dating and then married my girlfriend's Aunt's sister whose funeral was at the start of the story. He had died many years prior so the cycle passed to her, to the Aunt&Uncle, to me. End of story. Whew!

So now the real work begins. I'm going to share some additional images of when I got her home and cleaned her up. Then I'm going to post a TON of questions! Like I said, it's my first rebuild and I really want to do this dream find justice. Please let me know any and all your advice! I'm going to post a bullet list of questions after this little slide show. Thanks for reading and be sure to help me answer some questions below!!

Last picture with her old home. On the road again! Her first bath was a wind bath. It got rid off all those spider webs that you see in this pic!


In the driveway and ready for her first bath. Are there any purists out there that would rather keep all dirt??




And viola! Showroom new!!





Remember: Preserver Nature, Always Wear a Helmet, Think Safety!! All the stickers like this are still on the frame. The original tires are dry rotted but still have the little new tire nubs on them!!


I didn't spend a lot of time cleaning or spraying water into this area but included the picture for comparison to the previous engine shot.



Didn't I say the paint looked great?! It makes me taste Orange soda every time I look at it!


Don't think I forgot about the fairing and saddlebags! Anybody know the brand?? I don't think I want to include them in the final build so would possibly sell and use the funds to restore the bike. Any idea of value?? The saddlebag that the bike was laying on when it on it's side is cracked but it's a clean crack. The other bag and fairing are cherry!!


What I know:
  • The engine doesn't turn using the kickstarter. Locked up tight!
  • The gas is turned to the off position.
  • The choke is all the way pushed down. idk if that means open or closed.
  • The gas tank has a weird buildup under the cap and smells really bad. I can post a pic.
  • The front brake lever has no resistance. It just flops back and forth.
  • The rear brake foot lever operates and appears to engage the rear brakes.
  • The front forks leaked oil onto my garage floor after we unloaded it from the pickup.
  • The battery is still installed under the seat.
  • The clutch appears to work (has tension) but I haven't tried to shift gears yet.
  • Is there anything else I should evaluate to include on this list?

Questions:
  • So, what is my first step? I'm going to gather as much info before I start but where do I start? A friend said to put Miracle Oil in the oil reservoir after draining it and then seeing if it frees the pistons.
  • Should I break the project into stages? Like start with the front suspension and brakes, then tackle the engine and then do the rear?
  • I see the forums have the service manuals listed but what books should I need to buy? Haynes or Clymer??
  • Who made those saddlebags and fairing? What are they worth and where could I sell them?
  • Did I mess up by washing away all that valuable dirt and grime??
  • What major pitfalls can I expect/look out for?
  • If this was your bike, what would you do with it? Chop, cafe, original??
  • What questions am I forgetting to ask? (Starting questions. I know I'm going to have a million detail questions!)
  • Give me your closest cost estimate to getting this back on the road. I'll post the cost total when I'm done doing the first test ride and the person who guesses closest gets a shoutout.

Thanks and I'm looking forward to getting going! Check back for updates!!
« Last Edit: September 15, 2015, 09:39:17 PM by Funkenstein »
••• ——— •••• —•—• ••••—
Texas Barn Find
1974 CB750K4 - Flake Sunrise Orange - 955 Miles
Minimally Invasive Restore

Offline 70CB750

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Re: Texas Barn Find - 1974 CB750K4 - HELP ME OUT!!!
« Reply #1 on: September 15, 2015, 11:01:17 AM »
Go buy yourself a lottery ticket, you are pretty darn lucky bastard  ;D ;D
Prokop
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I love it when parts come together.

Dorothy - my CB750
CB750K3F - The Red
Sidecar


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2006 KLR650

Offline 70CB750

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Re: Texas Barn Find - 1974 CB750K4 - HELP ME OUT!!!
« Reply #2 on: September 15, 2015, 11:04:57 AM »
With a bit of luck, you could be riding her in few month  ;D

- Original, no question about it.
- Brakes need to be rebuilt.
- Oil in yes, but into cylinders not the oil tank, most lilely rings are rusted in cylinders but they can often be freed.
- Downlaod shop manual and buy book by Mark Paris on CB750, it covers exactly what you want do.  Available at Lulu. http://forums.sohc4.net/index.php/topic,65293.0.html
« Last Edit: September 15, 2015, 11:07:18 AM by 70CB750 »
Prokop
_______________
Pure Gas - find ethanol free gas station near you

I love it when parts come together.

Dorothy - my CB750
CB750K3F - The Red
Sidecar


CB900C

2006 KLR650

Offline 70CB750

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Re: Texas Barn Find - 1974 CB750K4 - HELP ME OUT!!!
« Reply #3 on: September 15, 2015, 11:13:54 AM »
I kind of spit it out in increments.  First, take off the tank and side covers and put them aside, check the tank for dried out gasoline, if there is some it is likely honey like and it has to be cleaned out.  It would be shame to ding the tank or crack the covers.  They can be stuck in rubber   grommets, go slowly and force nothing.

Take off the petcock, it will need rebuilding/repacking.

Take off the carburetors, they have to be rebuilt too. Member Hondaluv does it professionally btw. 

Soak the cylinders with penetrating oil and try to free pistons using the bolt on the LEFT side of the engine to rotate the engine.

Prokop
_______________
Pure Gas - find ethanol free gas station near you

I love it when parts come together.

Dorothy - my CB750
CB750K3F - The Red
Sidecar


CB900C

2006 KLR650

Offline mrbreeze

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Re: Texas Barn Find - 1974 CB750K4 - HELP ME OUT!!!
« Reply #4 on: September 15, 2015, 11:18:31 AM »
Awesome find. Right place at the right time! I would try to free up the engine first. Then get ready to spend some time & money. New battery, oil & filter, Rebuild carbs & brakes, tires. Most of the damage is due to sitting....not miles. As you go along you will find more things that will need to be done.....gas tank cleaned out, tune up, etc. Damn!!! It isn't even broke in yet as far as miles go. How's the exhaust? Look all around all of the pipes for rust/corrosion. Those pipes are high $$ items.
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Offline SOHC4 Cafe Racer Fan

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Re: Texas Barn Find - 1974 CB750K4 - HELP ME OUT!!!
« Reply #5 on: September 15, 2015, 11:51:33 AM »
I kind of spit it out in increments.  First, take off the tank and side covers and put them aside, check the tank for dried out gasoline, if there is some it is likely honey like and it has to be cleaned out.  It would be shame to ding the tank or crack the covers.  They can be stuck in rubber   grommets, go slowly and force nothing.

Take off the petcock, it will need rebuilding/repacking.

Take off the carburetors, they have to be rebuilt too. Member harisuluv does it professionally btw. 

Soak the cylinders with penetrating oil and try to free pistons using the bolt on the LEFT side of the engine to rotate the engine.

FTFY -- harisuluv (James Harris)  http://forums.sohc4.net/index.php?action=profile;u=16522
1975 CB550K1 "Blue" Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold

Offline Funkenstein

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Re: Texas Barn Find - 1974 CB750K4 - HELP ME OUT!!!
« Reply #6 on: September 15, 2015, 12:51:32 PM »
Thanks for the responses everyone! 70CB750, I have the book on order. Even got 15% off the lulu order by looking up a coupon online. Total spent so far on project: $94.22! haha! Not including gas spent picking her up! mrbreeze, thanks for the info on the pipes. They look great externally except for the end tip rings which are pretty rusty. I can take a few pics that focus on the pipes! Like I said I'm going to keep the bike as factory spec as possible but for curiosity sake, what do these pipes go for in the after market? I'm not keeping the fairing and bags, any clue on those?

To do list so far (in no particluar order):
  • Buy lottery ticket!
  • Buy hondaman's book!
  • Remove, clean, protect, store the gas tank and side covers going slowly to protect grommets
  • Remove petcock(snicker!), rebuild, repack
  • Remove carburetors, rebuild(harisuluv)
  • Miracle Oil in the cylinders and try to free pistons using cam bolt to rotate engine
  • Rebuild front suspension, tapered steering head bearings, progressive springs
  • Refurbish swing arm? Necessary on a bike with this low mileage?
  • Rebuild front brakes(necessary? new brake pads better?) and replace fluid
  • Replace spark plugs
  • Upgrade ignition(DynaS or Hondaman?)
  • Cam chains? Tensioners? Again, low mile bike would need this?
  • Gasket set, piston rings, engine seal set?
  • Porting the head?
  • Inspect/Rebuild rear brakes?
  • Rebuild/Upgrade rear suspension?
••• ——— •••• —•—• ••••—
Texas Barn Find
1974 CB750K4 - Flake Sunrise Orange - 955 Miles
Minimally Invasive Restore

Offline 70CB750

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Re: Texas Barn Find - 1974 CB750K4 - HELP ME OUT!!!
« Reply #7 on: September 15, 2015, 01:10:43 PM »
There is also Pamco ignition: http://www.cb750ignition.com/ quite few people run that, myself included.

Kick start can be used to turn the engine over too, but the nut gives you more control.

I would take apart and put back together all brake parts, maybe bought SS lines to replace the rubber with (http://slingshot-cycles.com is a member here, gives discounts to members afaik)

After you get her on the road, she will tell you what she needs.  Good luck  :)

Can you tell I am on a long business conference call and bored to death?  ;D ;D
Prokop
_______________
Pure Gas - find ethanol free gas station near you

I love it when parts come together.

Dorothy - my CB750
CB750K3F - The Red
Sidecar


CB900C

2006 KLR650

Offline 754

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Re: Texas Barn Find - 1974 CB750K4 - HELP ME OUT!!!
« Reply #8 on: September 15, 2015, 01:20:15 PM »
 You suck..
 Nice bike,I would just clean it and ride it, leave them splotches on the valvecover.. Fits in with the story..
Stop worrying about the value of the pipes, just run them on the bike.. Motor should unstuck..be patient..


So cafe,  brat or chopper..what will it end up as..?
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It's All part of the ADVENTURE...

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Lost quite a few CB 750's along the way

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Re: Texas Barn Find - 1974 CB750K4 - HELP ME OUT!!!
« Reply #9 on: September 15, 2015, 01:28:16 PM »
Wow. Time capsule.
1975 CB550K1 "Blue" Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold

Offline Funkenstein

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Re: Texas Barn Find - 1974 CB750K4 - HELP ME OUT!!!
« Reply #10 on: September 15, 2015, 02:22:39 PM »
Thanks again everyone! I'm pretty psyched to start the project so I appreciate all the input. 70CB750, thanks for the advice on the brakes. Those lines look slick! Also that ignition is one to consider. 754, "You Suck" is by far the most frequent comment I keep getting. haha!  Like I said, I want a minimally invasive restore just to get her rolling again. If I ever sell it, someone else can do the chop but it's staying stock as long as I have it. Pipes and rust are staying put. Like you said, it fits the story!
••• ——— •••• —•—• ••••—
Texas Barn Find
1974 CB750K4 - Flake Sunrise Orange - 955 Miles
Minimally Invasive Restore

Offline Johnie

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Re: Texas Barn Find - 1974 CB750K4 - HELP ME OUT!!!
« Reply #11 on: September 15, 2015, 02:52:18 PM »
First...buy me a lottery ticket :)  Great find and congrats to you. Those do not come around to often. Great story!!!
Seems the guys here like 50% ATF & 50% acetone mixed to free the engine. I bet you can free her up and run it once you have the carbs and tank cleaned and do the tune up. We are so glad you are keeping it stock. That bike deserves stock in the condition it is in. When you take off the left side cover be very careful with the bottom tab. That is where they like to break. (Try pushing it out from the back). You will put in new rubber grommets anyway, but put some penetrating oil or something on the tab to help it slide out. A lot of the parts are still available from Honda like the master cylinder kit, caliper seal, etc. Some guys just do not have much luck with aftermarket parts, but you are sure of the quality if you get OEM. Of course it depends on your wallet too. Find yourself a good dealer to work with. Tires...there are vintage looking tires out there. Don't forget to use the search function on the board. And a word of caution...do not ask, "what oil should I use" as that has been asked a million times :) and you can find that answer in the search area. Welcome to the board and we are looking forward to your project thread...

PS That tank looks great. It was common for that color to fade on the top. She looks like she did not see much sun.
 
PSS If you use the ATF / acetone in the cylinders let it sit for over a week. Some guys let it sit for a month if you can stand the wait. But when you decide to try and kick it over with the plugs out, be sure to put a rag over the plug holes. I think the record is like 30 feet oil has shot across the room. :)

PSSS When you do free it up and get ready to start it up there is a start up procedure around here for bikes that have sat a long time. Like removing those 8 valve cover caps and putting some oil in the top end before you crank it up. Look for it you will be glad you did. Could keep from damaging the motor.

PSSSS Sorry for all the PSSSS'ssssss  You have come to the right place for your project. Just take your time.
« Last Edit: September 15, 2015, 03:01:38 PM by Johnie »
1970 CB750K0 - Candy Ruby Red
1973 CB750K3 - Candy Bacchus Olive or Sunflake Orange
1970 Chevy Chevelle SS396 - Cortez Silver
1976 GL1000 Sulphur Yellow

Oshkosh, WI  USA

Offline Stev-o

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Re: Texas Barn Find - 1974 CB750K4 - HELP ME OUT!!!
« Reply #12 on: September 15, 2015, 03:01:58 PM »
Welcome from Lake Travis.  Where is the barn, disappointed I didnt find her!

Mix a cocktail of Acetone/ATF, remove spark plugs and pour it down into the cylinders, let it set a day or two and rock the bike back and forth in 3rd gear.
I'm 1 for 2 freeing up a "stuck" motor with this method [most likely the rings are rusted to the cylinder].

You'll prolly have to pull the motor, hone the cylinders and replace the rings, at the least.
But who knows, you are a lucky guy.  Got a title??

On a sad [for you] note, those saddle bags and fairing are nearly worthless. I threw a fairing in the dumpster today!

What part of Austin do you stay? [I work in S Austin]

'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline Funkenstein

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Re: Texas Barn Find - 1974 CB750K4 - HELP ME OUT!!!
« Reply #13 on: September 15, 2015, 04:06:27 PM »
First...buy me a lottery ticket :)  Great find and congrats to you. Those do not come around to often. Great story!!!
Seems the guys here like 50% ATF & 50% acetone mixed to free the engine. I bet you can free her up and run it once you have the carbs and tank cleaned and do the tune up. We are so glad you are keeping it stock. That bike deserves stock in the condition it is in. When you take off the left side cover be very careful with the bottom tab. That is where they like to break. (Try pushing it out from the back). You will put in new rubber grommets anyway, but put some penetrating oil or something on the tab to help it slide out. A lot of the parts are still available from Honda like the master cylinder kit, caliper seal, etc. Some guys just do not have much luck with aftermarket parts, but you are sure of the quality if you get OEM. Of course it depends on your wallet too. Find yourself a good dealer to work with. Tires...there are vintage looking tires out there. Don't forget to use the search function on the board. And a word of caution...do not ask, "what oil should I use" as that has been asked a million times :) and you can find that answer in the search area. Welcome to the board and we are looking forward to your project thread...
Awesome, thanks Johnie! I have been searching the threads for tips and tricks and the inevitable "Stupid questions" to avoid so thanks for the advice. A friend with a few bikes suggested "seafoam" to free the pistons. If you fine folks recommend the ATF/Acetone, I'll run with that.
Quote
PS That tank looks great. It was common for that color to fade on the top. She looks like she did not see much sun.
I plan on taking extra precautions when I remove that tank for cleaning.
Quote
PSS If you use the ATF / acetone in the cylinders let it sit for over a week. Some guys let it sit for a month if you can stand the wait. But when you decide to try and kick it over with the plugs out, be sure to put a rag over the plug holes. I think the record is like 30 feet oil has shot across the room. :)
Will any ATF work(synthetic)? Time to stock up on shop rags!!
Quote
PSSS When you do free it up and get ready to start it up there is a start up procedure around here for bikes that have sat a long time. Like removing those 8 valve cover caps and putting some oil in the top end before you crank it up. Look for it you will be glad you did. Could keep from damaging the motor.
I'll research that in the threads as well. Already was sent a procedure from a friend(seafoam guy). I'm going to post here before I do anything to the engine.
Quote
PSSSS Sorry for all the PSSSS'ssssss  You have come to the right place for your project. Just take your time.
I have a long, mild, Austin winter so nothing but time. Would be nice to have it on the road for the spring or sooner but I'm in no rush. Thanks again for the advice and I'll post more as it comes!
••• ——— •••• —•—• ••••—
Texas Barn Find
1974 CB750K4 - Flake Sunrise Orange - 955 Miles
Minimally Invasive Restore

Offline Funkenstein

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Re: Texas Barn Find - 1974 CB750K4 - HELP ME OUT!!!
« Reply #14 on: September 15, 2015, 04:15:15 PM »
Welcome from Lake Travis.  Where is the barn, disappointed I didnt find her!

Mix a cocktail of Acetone/ATF, remove spark plugs and pour it down into the cylinders, let it set a day or two and rock the bike back and forth in 3rd gear.
I'm 1 for 2 freeing up a "stuck" motor with this method [most likely the rings are rusted to the cylinder].

You'll prolly have to pull the motor, hone the cylinders and replace the rings, at the least.
But who knows, you are a lucky guy.  Got a title??

On a sad [for you] note, those saddle bags and fairing are nearly worthless. I threw a fairing in the dumpster today!

What part of Austin do you stay? [I work in S Austin]
Yo Stev-o! Thanks for the advice! Barn is in Marquis, Texas. Sounds like ATF/Acetone is the way to go. I like the rocking in 3rd gear advice! I just have to see if it shifts first. haha! I work for Austin City Limits and I live up north off Oak Knoll and 183. Once it's running, I'll be up for a local SOHC4 meetup. Hope to meet you there!
••• ——— •••• —•—• ••••—
Texas Barn Find
1974 CB750K4 - Flake Sunrise Orange - 955 Miles
Minimally Invasive Restore

Offline Restoration Fan

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Re: Texas Barn Find - 1974 CB750K4 - HELP ME OUT!!!
« Reply #15 on: September 15, 2015, 04:54:00 PM »
First of all, congratulations.
Second, damn...just...damn!  You are one lucky individual.
Follow Stev-o's advice first and get the engine unstuck. 
Also follow 70CB750's advice and get the tank cleaned out.
Meanwhile, take those carbs off and send them to Harrisuluv.  Getting your carbs working properly is quite possibly the most important aspect of getting your bike working and running well.

Take out your tool kit and find the spark plug tool.  Use that to remove the spark plugs.  Buy 4 D8EA plugs and you'll want to use those to replace the old ones.
Change the oil and oil filter.
New tires...no way you're going to ride on 40 year old tires.
New battery...many on here prefer Scorpion.  That's the one I have and I heartily endorse it.

You have already taken the proper first step....you posted a build thread on this forum.  You're going to find that the people on here are the single most awesome and helpful people you'll ever come across.  The amount of information, expertise, and willingness to help is simply unprecedented.

Then, and most important of all, go sign yourself up for the Motorcycle Safety Foundation (MSF) course before you start riding.  You'll learn more about handling your bike than you would think and you'll get some valuable experience and at the end, your motorcycle license.  The cost of the course more than be offset by the savings in your insurance.

Finally, and most importantly, enjoy that bike.

(I take that back, ever more important.....keep us updated and post lots more photos!)

Ron


« Last Edit: September 15, 2015, 04:56:16 PM by Restoration Fan »
Ron

Stella - Logan's Senior Project    78 750K http://forums.sohc4.net/index.php?topic=141761.0

Logan's Reward - CB500 and CB550 Cafes    http://forums.sohc4.net/index.php/topic,147787.0.html

Offline Johnie

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Re: Texas Barn Find - 1974 CB750K4 - HELP ME OUT!!!
« Reply #16 on: September 15, 2015, 05:20:27 PM »
Another useful tip...the thumb latch on the gas cap breaks off easily. To prevent this, push down on the cap first and then push the latch. Use a 6 point socket for the oil filter bolt. These tend to be tightened to much and strip easily. Hopefully the mice did not get to the wiring. Did it come with a title?
« Last Edit: September 15, 2015, 05:22:10 PM by Johnie »
1970 CB750K0 - Candy Ruby Red
1973 CB750K3 - Candy Bacchus Olive or Sunflake Orange
1970 Chevy Chevelle SS396 - Cortez Silver
1976 GL1000 Sulphur Yellow

Oshkosh, WI  USA

Offline oldhatt45

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Re: Texas Barn Find - 1974 CB750K4 - HELP ME OUT!!!
« Reply #17 on: September 15, 2015, 05:54:24 PM »
Funkenstein,

Welcome and GREAT FIND!!!!!

One thing no  one has mentioned yet.
All the Screws on your Bike are "JIS".  Do NOT use a regular Philips Head Screw Driver on them. 
The bike is Way too Nice to mess up the screws.
A member here can sell you a JIS Screwdriver Set that will last you a long time.  And Get the Impact wrench as well.
The members handle is RRRToolSolutions  and his web site is http://www.rrrtoolsolutions.com/   

I've been restoring my CB750 K6 (1976) that I've had since new and have done a bunch of stuff you'll likely need to do.
1.  Rebuild Master Cylinder - Very likely the brake fluid had turned to Goooo.  (Use only DOT3 fluid)
2.  Rebuild Caliper - New O-Ring seal, New Stainless or Phenolic piston.  New Pads
3.  Clean out the Swingarm.  The old grease has likely turned to Jelly.
4.  New Sprockets and Chain.  Not from wear, but from age.  Sprockets are probably OK but the chain has probably
     rusted.
5.  New Fork Seals and Fork Oil.
6.  Check the electrical connectors for oxidation.
7.  Clean the Gas Tank and petcock!!!
8.  Everything the rest of the guys have said.  LOL  :)

The bags are possibly Bates and were (a long time ago) very popular with the Harley Guys.  Fairing is very likely a Wixom.  Have absolutely no idea what they are worth.  :)

Good Luck With the Bike!!!!!!  And keep us posted on progress.

Charlie

Offline carnivorous chicken

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Re: Texas Barn Find - 1974 CB750K4 - HELP ME OUT!!!
« Reply #18 on: September 15, 2015, 07:00:51 PM »
One more congrats, and you've been getting some sound advice. I'd leave it stock. You may be able to sell the saddle bags and faring -- some people are after those things -- but not for more than $100 or so, depending on your local market.

I would add: your front brake master cylinder piston is likely locked up. You'll have to boil it or use heat to try to free it up. Don't use something like CLR -- it'll ruin it. Same with caliper.

Do check to make sure your exhaust isn't rusty or rotted on the underside. I bet it isn't. Lucky for you.

When you take off the side covers, as others have said, be careful. Spraying lubricant on them and pressing out the tabs from the inside will help ensure that you don't break them.

I should add: if I was you, I would keep the points ignition system and not swap it out until you get the thing running -- one less thing to worry about. And, if I was you, even then I wouldn't swap out the ignition. I'm a fan of points, they work well, I understand them, and when something goes wrong they can usually be cleaned up on the side of the road and you're back in business, unlike electronic ignition.
If you decide to reline your tank, don't use Kreem. Use POR 15 or Redkote, others will recommend Caswell but I haven't used that.

Even if you have to rebuild the top end -- or pay someone to do it -- you have yourself a killer bike at a killer price!

I would add: If I was you, I wouldn't replace the points with electronic ignition right off the bat, get the thing running. And even then I would keep the points -- the work fine, they're easy to work on, and if something goes wrong they won't leave you stranded.
« Last Edit: September 15, 2015, 07:12:28 PM by carnivorous chicken »

Offline Funkenstein

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Re: Texas Barn Find - 1974 CB750K4 - HELP ME OUT!!!
« Reply #19 on: September 15, 2015, 07:20:25 PM »
First of all, congratulations.
Second, damn...just...damn!  You are one lucky individual.
Follow Stev-o's advice first and get the engine unstuck. 
Also follow 70CB750's advice and get the tank cleaned out.
Meanwhile, take those carbs off and send them to Harrisuluv.  Getting your carbs working properly is quite possibly the most important aspect of getting your bike working and running well.

Take out your tool kit and find the spark plug tool.  Use that to remove the spark plugs.  Buy 4 D8EA plugs and you'll want to use those to replace the old ones.
Change the oil and oil filter.
New tires...no way you're going to ride on 40 year old tires.
New battery...many on here prefer Scorpion.  That's the one I have and I heartily endorse it.

You have already taken the proper first step....you posted a build thread on this forum.  You're going to find that the people on here are the single most awesome and helpful people you'll ever come across.  The amount of information, expertise, and willingness to help is simply unprecedented.

Then, and most important of all, go sign yourself up for the Motorcycle Safety Foundation (MSF) course before you start riding.  You'll learn more about handling your bike than you would think and you'll get some valuable experience and at the end, your motorcycle license.  The cost of the course more than be offset by the savings in your insurance.

Finally, and most importantly, enjoy that bike.

(I take that back, ever more important.....keep us updated and post lots more photos!)

Ron
Thanks Ron! I'm feeling pretty lucky to have found this forum! I hope I can do justice to this bike. I really appreciate your reply. The plan of attack you outlined is exactly where all this research is leading me but you summed it up perfectly! I'm posting some more pics now and a numbered list instead of a bullet list that's based around your advice. Hope I'm up and riding soon! I have a motorcycle license from my first bike a decade ago when I learned to ride. It had anti-lock brakes so I plan on a huge learning curve for this bike. Thanks again and look out for new pics soon!
••• ——— •••• —•—• ••••—
Texas Barn Find
1974 CB750K4 - Flake Sunrise Orange - 955 Miles
Minimally Invasive Restore

Offline Funkenstein

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Re: Texas Barn Find - 1974 CB750K4 - HELP ME OUT!!!
« Reply #20 on: September 15, 2015, 07:30:02 PM »
Another useful tip...the thumb latch on the gas cap breaks off easily. To prevent this, push down on the cap first and then push the latch. Use a 6 point socket for the oil filter bolt. These tend to be tightened to much and strip easily. Hopefully the mice did not get to the wiring. Did it come with a title?
I had to push down the gas cap to get it to operate at all. It seems to lock otherwise. The wiring looks clean but the fairing smells like rodent urine.

About the title. No title yet but the Aunt and Uncle are still looking. I know there's a lost title process and the Aunt and Uncle have ownership of the property where it was parked and a traceable history of ownership of the property since it was parked there 40 years ago. Is that going to be a problem? This is a subject that has started to creep up on my radar as a worry.
••• ——— •••• —•—• ••••—
Texas Barn Find
1974 CB750K4 - Flake Sunrise Orange - 955 Miles
Minimally Invasive Restore

Offline Johnie

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Re: Texas Barn Find - 1974 CB750K4 - HELP ME OUT!!!
« Reply #21 on: September 15, 2015, 07:33:53 PM »
Stev-o from TX can help you do what you need to do in TX. There are ways to get a title so don't worry about that for now. It is doable...
1970 CB750K0 - Candy Ruby Red
1973 CB750K3 - Candy Bacchus Olive or Sunflake Orange
1970 Chevy Chevelle SS396 - Cortez Silver
1976 GL1000 Sulphur Yellow

Oshkosh, WI  USA

Offline carnivorous chicken

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Re: Texas Barn Find - 1974 CB750K4 - HELP ME OUT!!!
« Reply #22 on: September 15, 2015, 07:34:45 PM »
Another useful tip...the thumb latch on the gas cap breaks off easily. To prevent this, push down on the cap first and then push the latch. Use a 6 point socket for the oil filter bolt. These tend to be tightened to much and strip easily. Hopefully the mice did not get to the wiring. Did it come with a title?
I had to push down the gas cap to get it to operate at all. It seems to lock otherwise. The wiring looks clean but the fairing smells like rodent urine.

About the title. No title yet but the Aunt and Uncle are still looking. I know there's a lost title process and the Aunt and Uncle have ownership of the property where it was parked and a traceable history of ownership of the property since it was parked there 40 years ago. Is that going to be a problem? This is a subject that has started to creep up on my radar as a worry.


You can always go the Vermont route, cost you about a hundred bucks to get a valid Vt registration, then however much to get a TX title -- VT doesn't issue titles for old bikes, so other states accept the registration and will issue a title.

Offline calj737

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Re: Texas Barn Find - 1974 CB750K4 - HELP ME OUT!!!
« Reply #23 on: September 15, 2015, 07:41:37 PM »
I too would do everything in my power to keep the bike as stock as possible. Rebuilt, but stock.

Before dismantiling the engine, verify oil in the tank and use the stator bolt as 70CB said to try to rotate the crank with a breaker bar. MMO, ATF/Acetone, whatever you choose drizzled into the cylinders will definitely help. It tends to be the pair of pistons at BDC that are stuck.

Remove the highway bars and saddlebag hardware too.

Fantastic looking bike, and very happy, happy for you!
Another useful tip...the thumb latch on the gas cap breaks off easily. To prevent this, push down on the cap first and then push the latch. Use a 6 point socket for the oil filter bolt. These tend to be tightened to much and strip easily. Hopefully the mice did not get to the wiring. Did it come with a title?
I had to push down the gas cap to get it to operate at all. It seems to lock otherwise. The wiring looks clean but the fairing smells like rodent urine.

About the title. No title yet but the Aunt and Uncle are still looking. I know there's a lost title process and the Aunt and Uncle have ownership of the property where it was parked and a traceable history of ownership of the property since it was parked there 40 years ago. Is that going to be a problem? This is a subject that has started to creep up on my radar as a worry.


You can always go the Vermont route, cost you about a hundred bucks to get a valid Vt registration, then however much to get a TX title -- VT doesn't issue titles for old bikes, so other states accept the registration and will issue a title.
'74 550 Build http://forums.sohc4.net/index.php?topic=126401.0
'73 500 Build http://forums.sohc4.net/index.php?topic=132935.0

"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline Funkenstein

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Re: Texas Barn Find - 1974 CB750K4 - HELP ME OUT!!!
« Reply #24 on: September 15, 2015, 07:42:30 PM »
Funkenstein,

Welcome and GREAT FIND!!!!!

One thing no  one has mentioned yet.
All the Screws on your Bike are "JIS".  Do NOT use a regular Philips Head Screw Driver on them. 
The bike is Way too Nice to mess up the screws.
A member here can sell you a JIS Screwdriver Set that will last you a long time.  And Get the Impact wrench as well.
The members handle is RRRToolSolutions  and his web site is http://www.rrrtoolsolutions.com/   

I've been restoring my CB750 K6 (1976) that I've had since new and have done a bunch of stuff you'll likely need to do.
1.  Rebuild Master Cylinder - Very likely the brake fluid had turned to Goooo.  (Use only DOT3 fluid)
2.  Rebuild Caliper - New O-Ring seal, New Stainless or Phenolic piston.  New Pads
3.  Clean out the Swingarm.  The old grease has likely turned to Jelly.
4.  New Sprockets and Chain.  Not from wear, but from age.  Sprockets are probably OK but the chain has probably
     rusted.
5.  New Fork Seals and Fork Oil.
6.  Check the electrical connectors for oxidation.
7.  Clean the Gas Tank and petcock!!!
8.  Everything the rest of the guys have said.  LOL  :)

The bags are possibly Bates and were (a long time ago) very popular with the Harley Guys.  Fairing is very likely a Wixom.  Have absolutely no idea what they are worth.  :)

Good Luck With the Bike!!!!!!  And keep us posted on progress.

Charlie
Hey Charlie! Thanks for the tips! I need an impact tool so might as well support a forum member. I'm adding all those tasks to my overall list that I'm posting shortly. That is exactly what I'm looking for so thank you very much! I thought I saw Wixom mentioned in my Internet travels today. I'm posting some more photos soon with a few more questions also. Haha! Thanks again!
••• ——— •••• —•—• ••••—
Texas Barn Find
1974 CB750K4 - Flake Sunrise Orange - 955 Miles
Minimally Invasive Restore