Author Topic: Resurrection of a cb750 K6 (update 9/28/12)  (Read 51870 times)

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Offline Greggo

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Re: Resurrection of a cb750 K6 (update 4/22/12)
« Reply #125 on: April 22, 2012, 06:14:13 PM »
Good work Hoo!  I just pulled the front end off my '76K, and it sure doesn't feel good to dismantle that many pieces after putting in so much work on the rest of the bike, huh?!  Makes putting it back together a little bit sweeter tho!

Offline hoodellyhoo

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Re: Resurrection of a cb750 K6 (update 4/22/12)
« Reply #126 on: April 22, 2012, 07:22:18 PM »
Good work Hoo!  I just pulled the front end off my '76K, and it sure doesn't feel good to dismantle that many pieces after putting in so much work on the rest of the bike, huh?!  Makes putting it back together a little bit sweeter tho!

putting parts back on makes me feel like this bike might actually get finished soon(ish). My goal is to be able to ride it to the vintage bike event at road america the second weekend of june. I was really worried that i would muck up the steering head bearings but was really happy when it went together easier than I thought.
1972 CB350F (Back from the Dead!)- http://forums.sohc4.net/index.php?topic=20822.0
1965? S65 - Coming Eventually!
1972 CB750K2 (father-son project)
1976 CB750K6- (sold) http://forums.sohc4.net/index.php?topic=96859.0
1976 CB750K6 (sold)- http://forums.sohc4.net/index.php?topic=62569.0

Offline Johnie

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Re: Resurrection of a cb750 K6 (update 4/22/12)
« Reply #127 on: April 22, 2012, 08:12:55 PM »
Very nice Trevor...you da' man.  ;D I have to get my latest pics up on the shop project. Had to check out how the bearings went. Nice job. I really can not wait to hear that K6 run...so cool.
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 jerry h

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Re: Resurrection of a cb750 K6 (update 4/22/12)
« Reply #128 on: April 22, 2012, 08:52:01 PM »
Hi Hoo -
Looking good - progress is being made.  This has been a fun thread to follow, can't wait to see the finished bike.   Isn't cleaning the gunk off the bottom of the engine fun! ;D   

"It is not the critic who counts, the credit belongs to the man who is actually in the arena, whose hands are covered with grease and oil."

K2 http://forums.sohc4.net/index.php/topic,105097.0.html

Offline thrutheframe

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Resurrection of a cb750 K6 (update 4/22/12)
« Reply #129 on: April 24, 2012, 07:05:00 AM »
The wife and I spent most of the day cleaning the house but I managed to get a couple hours in on the bike. I skipped a few steps ahead in doing this job but I was in the mood for some instant gratification and have been wanting to do this for a while.

I cleaned the rest of the dirt and dust off of the bodywork, including underneath the tank and the backsides of the sidecovers. I was debating taking off the tank trim because it's already cracked and fragile but I'm glad I did because there was a lot of dirt hiding underneath them. It's a shame new ones are so expensive because mine are cracked and yellowed.

I was curious to try a scratch removing compound I had bought. There are plenty of small and large scratches on this bodywork, mostly on the sidecovers. Well, the compound didn't work any magic, but I did follow that up with some wax and everything shined up nice (especially considering the age and how this bike was stored). The top of the tank has a little fade but what do you expect? It's a nice motivator to have shiny bodywork to stare at now and imagine it on the bike come spring.



As I said, I skipped ahead in doing this today. I still need to go back and fix the cracks on the sidecovers. I think I'm going to just superglue the cracks (most of them already have had this done) and then slather some JB weld behind the cracks on the backsides so provide support. I wanted to try my hand as reinforcing them with fiberglass but I'll stick with the JB just because it's what I have. Maybe if I get my homework done early enough I can do the tomorrow.

Super nice project Hoo. You've done some excellent work on this bike.  Your body work looks super sweet.  If you haven't already done it and if I may I'd like to say... Don't use super glue on your side covers.  The number one reason is that it will run out thru the crack and booger up your nice paint.  Reason two is without something to bite into even JB weld won't hold your crack together.  Take a small triangular file and a utility or an exacto knife and carve a v shaped groove into the back and then use the JB weld or a two part epoxy formulated for use with styrene plastic.  Your repair will last a long time.
'74 cb 750 K4
'79 CB 650 http://forums.sohc4.net/index.php?topic=83981.0
'75 CB 360T
'90 RC31 Hawk GT

Offline Johnie

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Re: Resurrection of a cb750 K6 (update 4/22/12)
« Reply #130 on: April 24, 2012, 10:40:53 AM »
I use some rough sandpaper to rough up the back of the cover before the JB is applied. Not only have I used it on cracks, but to strengthen the weak spots on these OEM covers.
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 hoodellyhoo

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Re: Resurrection of a cb750 K6 (update 4/22/12)
« Reply #131 on: April 24, 2012, 07:08:13 PM »
Super nice project Hoo. You've done some excellent work on this bike.  Your body work looks super sweet.  If you haven't already done it and if I may I'd like to say... Don't use super glue on your side covers.  The number one reason is that it will run out thru the crack and booger up your nice paint.  Reason two is without something to bite into even JB weld won't hold your crack together.  Take a small triangular file and a utility or an exacto knife and carve a v shaped groove into the back and then use the JB weld or a two part epoxy formulated for use with styrene plastic.  Your repair will last a long time.

Thanks for the compliments. If I remember correctly I only used superglue on the part that was broken off and on the really long crack on the top of the oil side cover. Both of those spots had been superglued previously so the "damage" had already been done. That, and these things aren't in the greatest of shape (the pictures make them look better). I suppose cutting a groove and using an epoxy would have been better. I was even talking to someone about using a carbon fiber reinforcement method. But I think this JB fix will hold fine for the foreseeable future. The backside of the cover was rough so there seemed to be enough for the JB to grab on to. I had to do some wrestling to get them on for the pictures in the last update, and they didn't break then so I was happy ;D
1972 CB350F (Back from the Dead!)- http://forums.sohc4.net/index.php?topic=20822.0
1965? S65 - Coming Eventually!
1972 CB750K2 (father-son project)
1976 CB750K6- (sold) http://forums.sohc4.net/index.php?topic=96859.0
1976 CB750K6 (sold)- http://forums.sohc4.net/index.php?topic=62569.0

Offline hoodellyhoo

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Re: Resurrection of a cb750 K6 (update 4/22/12)
« Reply #132 on: April 24, 2012, 07:46:46 PM »
And for anyone who cares, one of my classes was canceled today so I took that couple hours and worked on the bike. I thought about removing the clearcoat on the engine but ended up doing lots of cleaning. I don't think I said it in my last update but I removed the side and center stands. I cleaned them and their hardware up as best I could (wire wheel and degreaser). The centerstand was as grungy as the rest of the chain area so that's soaking in degreaser for the night. Everything else cleaned up with some scrubbing.

As long as I was cleaning so much I cleaned all the dust and dirt off the coils.

There's a crowded shelf where I've been keeping all of my finished parts so in order to make some room I put the front turn signals, horn, and idiot lights back on the bike. I discovered that the left headlight ear is bent a little. You can see in the first post of this thread that the left turn signal droops a little. I tried to bend it back some but it wouldn't move and I didn't want to force it. At least it's not too noticeable.

The last thing I did was to start cleaning the chain gaurd and rear inner fender. With the inner fender cleaned I can put the rear fender, signals, shocks, and grab bar back on. I might still pull the rear brake linkage and brake stay to clean them up.

Right now the biggest job left is getting the polishing done. I need all the room I can get to polish the engine (aka, I have to wait to put a bunch of parts on till that's done). And I can't lower the bike down till I have the front fork lowers polished. Once that's taken care of things should move quicker. I still need to order a few more parts, the biggest being tires and tubes. My goal of being on the road by june 8th is still within reach but I will need some good solid workdays to make it happen.
1972 CB350F (Back from the Dead!)- http://forums.sohc4.net/index.php?topic=20822.0
1965? S65 - Coming Eventually!
1972 CB750K2 (father-son project)
1976 CB750K6- (sold) http://forums.sohc4.net/index.php?topic=96859.0
1976 CB750K6 (sold)- http://forums.sohc4.net/index.php?topic=62569.0

Offline Greggo

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Re: Resurrection of a cb750 K6 (update 4/22/12)
« Reply #133 on: April 25, 2012, 08:21:38 PM »
Keep it up dude!  Canceled classes are awesome.

Offline flybox1

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Re: Resurrection of a cb750 K6 (update 4/22/12)
« Reply #134 on: April 26, 2012, 02:19:50 PM »
Gonna try this over the weekend...
The use of adhesive fiberglass drywall tape to strengthen my cracked sidecover, then coating with JB. 
its a mesh, with very small holes, but big enough to let the JB through.
a huge roll of it is about $4 at a hardware store.
a good rough sand and clean before applying the tape in several directions. then a good slathering of JB.
'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
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Offline hoodellyhoo

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Re: Resurrection of a cb750 K6 (update 4/22/12)
« Reply #135 on: April 27, 2012, 09:09:08 AM »
If anyone reading this has a good working right side handelbar switch they want to sell, let me know. It has to be from a 76 750k or a 550k. I'll do an update when I have time but the plastic framework for my starter button completely fell apart.
1972 CB350F (Back from the Dead!)- http://forums.sohc4.net/index.php?topic=20822.0
1965? S65 - Coming Eventually!
1972 CB750K2 (father-son project)
1976 CB750K6- (sold) http://forums.sohc4.net/index.php?topic=96859.0
1976 CB750K6 (sold)- http://forums.sohc4.net/index.php?topic=62569.0

Offline hoodellyhoo

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Re: Resurrection of a cb750 K6 (update 5/14/12)
« Reply #136 on: May 14, 2012, 03:05:44 PM »
It's been a few weeks since I did this work, but it's all I have to report on for now.

I was working on cleaning up my handelbars and switches when  inoticed that the starter button didn't look quite right. I pushed it and it didn't feel nice and tight and it didn't come out of the housing very far. This was obvously a replacement since everything about it looked nearly new while the left side switch was well worn and faded. I took it apart to discover that the framework for the starter switch mechanism was in about 20 pieces.



At first I thought I could just replace it with soem siwtch innards from my spares but this proved to be harder thatn a simple replacement. For one, the starter switch on the K6 automatically turns off the headlight when it is pushed (a feature I would lose with an earlier switch), and because of this I would have to figure out what to do with the extra headlight wire from the original switch. Also, the button is placed lower than on earlier switches so an earlier mechanism can't just be screwed into the k6 housing.

The newish switch that's now in the "spares" pile :(



After a half-assed attempt at finding a replacement (The part number is unique to the 76 550k and 750k), I decided to cobble together parts from three spare switches. As much as I would have liked to keep the newer switch housing and wires, I ended up only being able to use the kill switch knob (the ones in my spares were severly sundamaged and about to break). What I ended up with was an earlier switch housing which gives me the basic starter button mechanism and a manual headlight on-off switch. So now I can flash my headlight at someone if they're being an idiot! I'm not sure what bike this housing came off of but I find it odd that there is only on and off for the headlight (no low-high).



The other thing I worked on was the handelbar grips. I didn't like the foam grips that came on the bike so I replaced them with a new set of GT grips I bought but never used on the 350. The only problem was that the new grips are shorter than oem. Since I don't like seeing a gap between the grips and the switches I had to shorten the handelbars by about a half inch on each side. Harbor freight angle grinder for the win!

Bars too long



Here are both sides after shortening



1972 CB350F (Back from the Dead!)- http://forums.sohc4.net/index.php?topic=20822.0
1965? S65 - Coming Eventually!
1972 CB750K2 (father-son project)
1976 CB750K6- (sold) http://forums.sohc4.net/index.php?topic=96859.0
1976 CB750K6 (sold)- http://forums.sohc4.net/index.php?topic=62569.0

Offline Greggo

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Re: Resurrection of a cb750 K6 (update 5/14/12)
« Reply #137 on: May 14, 2012, 05:37:56 PM »
There was likely a 'low/high' switch on the left hand control that went with your righty...

Offline Stev-o

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Re: Resurrection of a cb750 K6 (update 5/14/12)
« Reply #138 on: May 20, 2012, 01:22:08 PM »
There was likely a 'low/high' switch on the left hand control that went with your righty...

Yes, that is how it is on my K4.  I like the on/off headlight switch, I keep it off for starting and warmup, less discharge off the battery. 
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline hoodellyhoo

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Re: Resurrection of a cb750 K6 (update 5/30/12)
« Reply #139 on: May 30, 2012, 08:15:36 PM »
I've been working on the bike a fair bit over the past couple of weeks but haven't had the time to do an update.

The first thing I worked on was buffing. I was having issues with cutting through these textured areas on the fork lowers using just the red rouge. I decided to try using black rouge and it worked great!. It cut through the rough areas and left a shine that I would say is as good as the red rouge. When I finally finished the fork lowers I did the sprocket cover. At some point in time a spent an hour with the wire wheel cleaning up all the nuts and bolts that go along with the fork lowers.





The finished products:



Got the points cover shined up. There's a good sharp dent in it but nothing horrible. Maybe I'll replace it if I find a better one for cheap.



This was last weekend and at the time I was dead set on getting the engine covers polished as long as the whole bike was apart. The issue was getting the old clearcoat off. The aircraft remover I have is from a spray can. I couldn't use that because I didn't want to risk getting some on the frame or engine cases. After a bit of searching I came across this:



I got it at walmart (by all the paint strippers). The nice thing is it's a gel so it doesn't run (as long as it's not put on too thick). I brushed it on being careful not to get any on the cases or frame. I was under a time constraint so I could only let it sit an hour.



Even though I only had an hour it seems to have done the trick. I washed it off with a brush and garden hose and I can't find any traces of clear left on the covers.

Now as I said before, this was when I was dead set on having the cases polished before reassembling the bike. My goal for finishing this bike was being able to ride it to the ahrma races at road america which is in a little over a week. Unfortunately I think I've just flat run out of time to finish the polishing. I want to have some time to do some test riding and troubleshooting before next weekend and there's just too much left to do it all in that timeframe. Maybe if I was able to devote the whole coming weekend to working on the bike, but there's other chores and projects I need to get done then too.I would rather be riding a bike with unpolished cases than not riding at all. I'll just add it to the list of things to do in the winter.

Since the weekend I've been doing whatever small jobs I have left while I wait for the last of my parts to arrive (mainly tires and tubes).

Cleaned up the footpegs and hardware (plan is to paint them in winter)



Tonight I disassembled, cleaned, and shined up the front fender. There are some dents on the top that I tried to fix a little. They're less noticeable now but I'm certainly no metal shaping guru.



I finished the night with taking apart the front wheel to get it ready for new tires and bearings and then pounding in my new fork seals.
« Last Edit: May 30, 2012, 08:19:00 PM by hoodellyhoo »
1972 CB350F (Back from the Dead!)- http://forums.sohc4.net/index.php?topic=20822.0
1965? S65 - Coming Eventually!
1972 CB750K2 (father-son project)
1976 CB750K6- (sold) http://forums.sohc4.net/index.php?topic=96859.0
1976 CB750K6 (sold)- http://forums.sohc4.net/index.php?topic=62569.0

Offline Johnie

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Re: Resurrection of a cb750 K6 (update 5/30/12)
« Reply #140 on: May 31, 2012, 05:15:38 AM »
Looks like pretty good progress there Trevor. Should be up and running soon.
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 thomellis

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Re: Resurrection of a cb750 K6 (update 5/30/12)
« Reply #141 on: May 31, 2012, 02:21:42 PM »
There is nothing like finally putting the parts back together, you finally start to feel you're accomplishing something haha

Offline Tews19

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Re: Resurrection of a cb750 K6 (update 5/30/12)
« Reply #142 on: May 31, 2012, 04:45:18 PM »
Hoodey what day are you planning on going to RA? A bunch of us are going this Sunday
1969 Honda CB750... Basket case
1970 Honda CB750 survivor.

Offline hoodellyhoo

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Re: Resurrection of a cb750 K6 (update 5/30/12)
« Reply #143 on: May 31, 2012, 07:35:00 PM »
Hoodey what day are you planning on going to RA? A bunch of us are going this Sunday

Are you talking about the superbike races this weekend? Cause I'm going to be there the weekend after for the ahrma races (8th-10th). I bought a weekend tickect so as long as the weather is okay I will be there, and hopefully I will be there with this bike!
1972 CB350F (Back from the Dead!)- http://forums.sohc4.net/index.php?topic=20822.0
1965? S65 - Coming Eventually!
1972 CB750K2 (father-son project)
1976 CB750K6- (sold) http://forums.sohc4.net/index.php?topic=96859.0
1976 CB750K6 (sold)- http://forums.sohc4.net/index.php?topic=62569.0

Offline Tews19

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Re: Resurrection of a cb750 K6 (update 5/30/12)
« Reply #144 on: May 31, 2012, 08:13:30 PM »
AHH that weekend too! Looking forward to that weekend more due to being vintage!
1969 Honda CB750... Basket case
1970 Honda CB750 survivor.

Offline hoodellyhoo

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Re: Resurrection of a cb750 K6 (update 5/30/12)
« Reply #145 on: June 03, 2012, 05:56:34 AM »
I don't have time right now for a full update but I've been working like crazy on the bike this weekend. Yesterday I spent almost the whole day doing wheel bearings and getting the font tire changed. I can't do the rear yet because the tube I bought was backordered (wish they would have told me that >:()

If everything goes okay today (it probably won't) I might just have a running bike tonight!
1972 CB350F (Back from the Dead!)- http://forums.sohc4.net/index.php?topic=20822.0
1965? S65 - Coming Eventually!
1972 CB750K2 (father-son project)
1976 CB750K6- (sold) http://forums.sohc4.net/index.php?topic=96859.0
1976 CB750K6 (sold)- http://forums.sohc4.net/index.php?topic=62569.0

Offline dhall57

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Re: Resurrection of a cb750 K6 (update 5/30/12)
« Reply #146 on: June 03, 2012, 06:28:25 AM »
I hear ya hoo, way to go!!!!!!!! Get that K6 running and on the road :) ;) :D ;D 8)

Be positive, don't say it won't, say it will.
« Last Edit: June 03, 2012, 06:35:02 AM by dhall57 »
1970 CB750KO
1971 CB500KO-project bike
1973 CB350G- project bike
1974 CB750K4-project bike
1974 CB750K4
1976 CB750K6
1977 GL1000
1997 Harley Wideglide

Offline hoodellyhoo

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Re: Resurrection of a cb750 K6 (update 5/30/12)
« Reply #147 on: June 04, 2012, 07:59:01 PM »
I will post a full update when I have time but between my internet class and finishing up the bike I probably won't get around to it till saturday at the earliest.

Long story short, I rallied all day on saturday and sunday and got the bike pretty much completely together.



The best part is SHE RUNS!!! I have a video I will upload. All cylinders are firing and other than being out of synch she sounds pretty good.

Unfortunately my rear tube was on backorder (which I was not told >:() so when that gets here on wednesday I can finally mount and balance the new rear tire, then hopefully get the new chain on and take it for a ride! I can't wait!
1972 CB350F (Back from the Dead!)- http://forums.sohc4.net/index.php?topic=20822.0
1965? S65 - Coming Eventually!
1972 CB750K2 (father-son project)
1976 CB750K6- (sold) http://forums.sohc4.net/index.php?topic=96859.0
1976 CB750K6 (sold)- http://forums.sohc4.net/index.php?topic=62569.0

Offline Greggo

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Re: Resurrection of a cb750 K6 (update 5/30/12)
« Reply #148 on: June 04, 2012, 08:22:52 PM »
Duuuuuuuuuuude!  She looks SO Good!!  Congratulations!

Offline kap384@telus.net

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Re: Resurrection of a cb750 K6 (update 5/30/12)
« Reply #149 on: June 04, 2012, 08:31:49 PM »
Gorgeous!
1965 Honda CB450K0
1972 Honda CT70K1
1975 Honda MR50
1975 Honda CB400F Supersport
1977 Honda CB750F2 Supersport
1978 Honda XL100
1979 Honda CBX Supersport
1982 Honda VF750S Sabre - Adventure Bike modified
1983 Honda CX650T
1995 Honda VFR750
2016 Honda CRF1000L Africa Twin
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1963 Suzuki T10
My 1977 CB750F restoration - http://forums.sohc4.net/index.php?topic=66779.0
My 1975 CB400F restoration -
http://forums.sohc4.net/index.php?topic=145196.msg1651779#msg1651779
'More Stock Than Not' thread - http://forums.sohc4.net/index.php?topic=90807.500
My CT70 Resurrection - http://forums.sohc4.net/index.php?topic=145221.0
Best Motorcycle Tool Ever - https://www.engduro.com