Author Topic: Marissa's 1972 CB500  (Read 95068 times)

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Offline Lostboy Steve

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Re: Marissa's 1972 CB500
« Reply #25 on: June 09, 2017, 02:52:01 AM »
I had never done wheel lacing before and I did it successfully without a truing stand. It just takes time and patience. You'll get it. 


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1968 Honda Z50
1977 Honda CB550K
2018 Indian Scout

Offline Scott S

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Re: Marissa's 1972 CB500
« Reply #26 on: June 09, 2017, 04:05:07 AM »
 Why are you relacing them? Just clean the spokes with some 0000 steel wool and polish up the hoops.
'71 CB500 K0
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'81 Yamaha XS650

Offline DaveBarbier

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Re: Marissa's 1972 CB500
« Reply #27 on: June 09, 2017, 04:34:11 AM »
What's your goal with the wheels? Just to clean them up or do you want stainless spokes? I'm with Scott that you can just polish them up and maybe hit them with a semi gloss clear for some rust prevention. That being said, lacing and truing isn't that hard. I've seen a bunch of newbies here do it just fine the first time.

You dynamically balance car tires. 99% of motorcycle tires are statically balanced. It's super easy, watch a YouTube video about it. I made my own balance stand out of a rod and skateboard bearings.

Oh, and you say now that you'll never go on the highway. Once you're fairly comfortable on the bike you'll venture out. I had a CB125 which couldn't go on the highway and it was super annoying to me and other riders who had to plan out different routes. A 500 is more than capable of highway cruising.

Nice seat so far. Going to go with black vinyl? And don't focus on being able to flat foot both feet at the same time. I can't even do that with my bike. Many guys on the big BMW touring bikes can only tippy toe also.


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Offline SOHC4 Cafe Racer Fan

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Re: Marissa's 1972 CB500
« Reply #28 on: June 09, 2017, 08:03:28 AM »
Another suggestion to making the seat more sturdy is running a bead an inch or so in from the edge and maybe an inner bead line as well.
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 Lostboy Steve

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Re: Marissa's 1972 CB500
« Reply #29 on: June 09, 2017, 08:54:56 AM »
What's your goal with the wheels? Just to clean them up or do you want stainless spokes? I'm with Scott that you can just polish them up and maybe hit them with a semi gloss clear for some rust prevention. That being said, lacing and truing isn't that hard. I've seen a bunch of newbies here do it just fine the first time.

You dynamically balance car tires. 99% of motorcycle tires are statically balanced. It's super easy, watch a YouTube video about it. I made my own balance stand out of a rod and skateboard bearings.

Oh, and you say now that you'll never go on the highway. Once you're fairly comfortable on the bike you'll venture out. I had a CB125 which couldn't go on the highway and it was super annoying to me and other riders who had to plan out different routes. A 500 is more than capable of highway cruising.

Nice seat so far. Going to go with black vinyl? And don't focus on being able to flat foot both feet at the same time. I can't even do that with my bike. Many guys on the big BMW touring bikes can only tippy toe also.


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I agree with all of that. I'm 6' tall and on my wr250r I am tippy toed. It's just the way it is.

IMO the highway is the nicest of rides depending on the conditions. Just relax and cruise.



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1968 Honda Z50
1977 Honda CB550K
2018 Indian Scout

Offline SOHC4 Cafe Racer Fan

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Re: Marissa's 1972 CB500
« Reply #30 on: June 09, 2017, 09:34:38 AM »
What's your goal with the wheels? Just to clean them up or do you want stainless spokes? I'm with Scott that you can just polish them up and maybe hit them with a semi gloss clear for some rust prevention. That being said, lacing and truing isn't that hard. I've seen a bunch of newbies here do it just fine the first time.

You dynamically balance car tires. 99% of motorcycle tires are statically balanced. It's super easy, watch a YouTube video about it. I made my own balance stand out of a rod and skateboard bearings.

Oh, and you say now that you'll never go on the highway. Once you're fairly comfortable on the bike you'll venture out. I had a CB125 which couldn't go on the highway and it was super annoying to me and other riders who had to plan out different routes. A 500 is more than capable of highway cruising.

Nice seat so far. Going to go with black vinyl? And don't focus on being able to flat foot both feet at the same time. I can't even do that with my bike. Many guys on the big BMW touring bikes can only tippy toe also.


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I agree with all of that. I'm 6' tall and on my wr250r I am tippy toed. It's just the way it is.

IMO the highway is the nicest of rides depending on the conditions. Just relax and cruise.



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I wish they were selling the wr250x here.
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 AlabamaCB750

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Re: Marissa's 1972 CB500
« Reply #31 on: June 09, 2017, 06:15:36 PM »
Hey!  Welcome to the best forum on the web Marissa! I have a similar build going, but with a 1972 CB750. I got mine because it was the year I was born. Very similar color, Brier Brown Metallic. I also lean toward the brat style seats and drag bars. My ex-wife was very short also, she rode a 1978 Twin Star Bobber....lol! Good luck on your build!
« Last Edit: June 09, 2017, 06:18:40 PM by AlabamaCB750 »

Offline 754

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Re: Marissa's 1972 CB500
« Reply #32 on: June 09, 2017, 11:23:23 PM »
Body metal might be 22 guage..
Maker of the WELDLESS 750 Frame Kit
dodogas99@gmail.com
Kelowna B.C.       Canada

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way

Offline Lostboy Steve

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Re: Marissa's 1972 CB500
« Reply #33 on: June 10, 2017, 04:48:54 AM »
What's your goal with the wheels? Just to clean them up or do you want stainless spokes? I'm with Scott that you can just polish them up and maybe hit them with a semi gloss clear for some rust prevention. That being said, lacing and truing isn't that hard. I've seen a bunch of newbies here do it just fine the first time.

You dynamically balance car tires. 99% of motorcycle tires are statically balanced. It's super easy, watch a YouTube video about it. I made my own balance stand out of a rod and skateboard bearings.

Oh, and you say now that you'll never go on the highway. Once you're fairly comfortable on the bike you'll venture out. I had a CB125 which couldn't go on the highway and it was super annoying to me and other riders who had to plan out different routes. A 500 is more than capable of highway cruising.

Nice seat so far. Going to go with black vinyl? And don't focus on being able to flat foot both feet at the same time. I can't even do that with my bike. Many guys on the big BMW touring bikes can only tippy toe also.


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I agree with all of that. I'm 6' tall and on my wr250r I am tippy toed. It's just the way it is.

IMO the highway is the nicest of rides depending on the conditions. Just relax and cruise.



Sent from my iPhone using Tapatalk
I wish they were selling the wr250x here.

It's a good bike, if I could do it over I'd buy a husky, BMW, or ktm. My buddy has an 09 450 BMW that rips.

.....sorry to hijack.


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1968 Honda Z50
1977 Honda CB550K
2018 Indian Scout

Offline SOHC4 Cafe Racer Fan

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Re: Marissa's 1972 CB500
« Reply #34 on: June 10, 2017, 06:51:53 AM »
The Husky 701 Supermoto is pretty spectacular, but I think the Yamaha would be fun to learn supermoto riding skills.

And yes, sorry about the threadjack!
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 NobleHops

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Re: Marissa's 1972 CB500
« Reply #35 on: June 10, 2017, 02:29:40 PM »
Welcome Marissa, nice to see you here!
Nils Menten * Tucson, Arizona, USA

I have a motorcycle problem.

My build thread: NobleHops makes a 400F pretty for his wife: http://forums.sohc4.net/index.php?topic=131210.0

Offline GV1390

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Re: Marissa's 1972 CB500
« Reply #36 on: June 10, 2017, 02:47:35 PM »
Marissa, welcome! These gentlemen are already steering you into the right direction with your build. Looks like a great starting platform.

Here is a picture of one of my CB's I had recently finished:



Keep up the good work. Also, those old Z's are loads of fun!

 :)
93' GSX-R1100, 78' CB550, 71' CL350, 71’ CB500 & 02' ZRX1200R.

Offline PeWe

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Re: Marissa's 1972 CB500
« Reply #37 on: June 11, 2017, 04:38:51 AM »
Drag bar is very comfortable, at least on a CB750. Really good bike control while riding. I used drag bar on long tours here in Europe, about 2500-3000km each way.
I use std cable lenghts for both throttle cables and clutch. Upper brake line need to be shorter though.
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline DaveBarbier

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Re: Marissa's 1972 CB500
« Reply #38 on: June 11, 2017, 07:03:58 PM »
Really nice to meet you Marissa and glad the tach housing is getting you one step closer to riding. Here are a couple links for you.

http://www.slingshotcycles.com/
For brake lines. Use code SOHC4 at checkout for a discount.

https://www.cmsnl.com/honda-cb500k1-four-1972-usa_model460/partslist/
Exploded views of all parts of your bike with part numbers. I copy and paste the part number in eBay and buy things that way normally.

If you find a Honda bike club let me know, haha


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Offline Marissa

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Re: Marissa's 1972 CB500
« Reply #39 on: July 15, 2017, 09:59:59 PM »
Hey guys,

Thank you for all the warm welcome and thanks to Dave for answering all my questions and for having that tach gear housing. It works great.

Sorry I haven't been posting progress more, I have been really busy with work and working on the CB as well. I generally get home at 6pm and work on the bike until midnight or so. Sometimes I even forget to have dinner haha.

So, I ended up doing what I told myself I would never do, and I went ahead and cut the rear frame to install a frame hoop. Blasphemy! Honestly, I was just scared to commit to modifying this bike in ways that are less forgiving than others, but I have strayed from that fear at this point. So, with frame slugs and all, this CB is hooped and looking so good. I'm happy I went ahead with it.

Went ahead and ground down some areas of excessive factory welds. Didn't even remove too much, mostly just sanding it to an even surface and feathering the area with some filler. Initially, I wanted to use some fiberglass filler, but it doesn't feather out as nicely, and I ran out. Regardless, it shouldn't be an issue as everything is gone through and cleaned with alcohol before getting primed and painted.

Did an oil change and found a nice surprise at the bottom of the filter housing. Slightly concerned, I purchased a magnetic oil drain plug (for what little it will do) as a way to see if there's excessive wear in the future, unfortunately I don't know how long this buildup was in there for.

I went ahead and converted the turn signals to minimal LEDs which are really impressive when on.

 More blasphemy, velocity stacks. I went up 3 sizes on the main jet and I just ordered slow jets which are 2 sizes larger, so when those get here hopefully the bike will be able to go around the block or so.

Took the bike outside today and up and down the driveway. It was nice seeing it outside of the garage for once.

I fixed a couple of issues I was having; I rebuilt the petcock long ago and recently its starting to give me issues. The CB500's have two brass nipples and for whatever reason, I can only get fuel to flow out of one at a time. I saw a post from someone having the same issue but it never states if it was corrected or not, so for now I blocked the back opening and just added a Y connector to the first one so it feeds both sets of carburetors. Not a permanent solution but it works. I also had problems with fuel flow because I had a fuel filter on... I totally didn't want to take it off because it let me see how the fuel was flowing, but sure enough after I removed it I saw an instant improvement.

I also previously bought stainless steel brake lines from 4into1 and they were truly awful, I'm lucky I found this out while the bike wasn't on the road, now the bike has a nice set of Goodridge lines.

If you look closely in the photos you can see a battery and wiring box mock up... Unsure it that will be the final form for them but that's current. I still need to button up the wiring in the rear, get tires, and inspect the rear wheel to see if I should keep it.. there are multiple spokes that are bent and I'm worried there's a flat spot. I also noticed today that my front tire is rotational and on backwards... Luckily it's dry rotted so it's not a big deal regardless, but who does that...

I custom fabricated my own side cover panels as well.

Not sure how much progress will be made in the near future, I will be going on vacation and then shortly after that, back to school. I'm hoping to get the wheels and tires sorted out next after the carbs are synched, then move to rebuilding the front forks, installing bronze swingarm bushings, etc. One thing is for sure, definitely want to get the engine and frame powder coated this winter.
« Last Edit: February 16, 2019, 08:16:15 PM by Marissa »
1984 Nissan 300zx - sold
2016 Ford Fiesta ST - daily
1972 Honda CB500 - infinite work in progress

Instagram- marissasimos

Offline Marissa

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Re: Marissa's 1972 CB500
« Reply #40 on: July 20, 2017, 06:43:55 PM »
Your carb jetting changes are going to be way off very likely. Simply upsizing jets due to velocity stacks is not all thats required, and I doubt very seriously whether 3 sizes up on the mains is fully required, and 2 up on the idles is probably very large too.

Did you buy true Keihin brand jets, or were they aftermarket? Are your carb needles in the stock clip, or did you move them to an enriched setting?

Yes, you are right and 3 sizes up was a bit too rich. But I am also not trying to install everything at once. I'm trying to put one different component on at a time so I can more accurately gauge the results of it. I'm assuming I will have to move the needle; I haven't yet so technically they should be in the factory placement but who knows. That itself should be an interesting task; when I first tried to take the needle assembly apart I couldn't get a good grip and angle on the screws and almost stripped one of them. I'll try soaking them in pb blaster next time I guess. And yes, they are Keihin jets! Dave told me to stay away from aftermarket whenever possible.

1984 Nissan 300zx - sold
2016 Ford Fiesta ST - daily
1972 Honda CB500 - infinite work in progress

Instagram- marissasimos

Offline DaveBarbier

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Marissa's 1972 CB500
« Reply #41 on: July 21, 2017, 04:57:30 AM »
Nice work so far, I was actually going to shoot you a text the other day to make sure you're still around, haha. I agree with Cal as far as you'll probably have to raise the needle a clip position or two. You'll have to do some plug chops to see what you need as for jets. Which screws are you taking about? The little ones attaching the arm to the bottom of the slide? Are you using actual JIS drivers, I think I remember you saying you did buy a set.

In the oil filter housing are you pointing out the sludge? I can't see any large pieces of metal. Sludge is normal as far as I know. I wouldn't worry about it.

If you have fuel flow or overflow problems in the future, consider removing all those connections to the overflow tubes. From factory there's just one tube coming off each bowl down behind the motor. You've increased the likely hood of all bowls being unable to overflow and vent properly if that one tube gets clogged. Many people just use windshield washer hoses. It's cheap and will hold up fine with the amount of fuel it sees.

Is there an in tank filter sock? If so, you don't need an additional filter.

Nice side cover panels. How's the "feet touching the ground" issue?

Agree with Cal with the truing stand. New spokes and you should be good to go. Unless of course there's damage from an impact like the PO got rear ended. But it doesn't seem like there's any damage like that.

Again, nice progress!

Offline Marissa

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Re: Marissa's 1972 CB500
« Reply #42 on: July 21, 2017, 05:39:42 PM »
Nice work so far, I was actually going to shoot you a text the other day to make sure you're still around, haha. I agree with Cal as far as you'll probably have to raise the needle a clip position or two. You'll have to do some plug chops to see what you need as for jets. Which screws are you taking about? The little ones attaching the arm to the bottom of the slide? Are you using actual JIS drivers, I think I remember you saying you did buy a set.

In the oil filter housing are you pointing out the sludge? I can't see any large pieces of metal. Sludge is normal as far as I know. I wouldn't worry about it.

If you have fuel flow or overflow problems in the future, consider removing all those connections to the overflow tubes. From factory there's just one tube coming off each bowl down behind the motor. You've increased the likely hood of all bowls being unable to overflow and vent properly if that one tube gets clogged. Many people just use windshield washer hoses. It's cheap and will hold up fine with the amount of fuel it sees.

Is there an in tank filter sock? If so, you don't need an additional filter.

Nice side cover panels. How's the "feet touching the ground" issue?

Agree with Cal with the truing stand. New spokes and you should be good to go. Unless of course there's damage from an impact like the PO got rear ended. But it doesn't seem like there's any damage like that.

Again, nice progress!

Hey Dave,

Yeah, I'm talking about the screws in the bottom of the slide. I think I was going to try putting the housing in my bench vise but I didn't want to risk damaging it externally. How did you go about removing them? And yeah, they're JIS.

Also, it is just sludge in the oil filter housing, but it literally feels just like a glob of aluminum anti seize, and totally looks like it too. Is that normal? There was also traces of that stuff on the sides of the cam, and a little bit on the bottom of the breather assembly thing on the top of the valve cover assembly.

I replaced the overflow hoses as they were completely dry rotted and stuck, and we actually found the the overflow tubes were PACKED with varnish. I found this out when I was soldering the cracks on them and certain ones kept smoking. We took the smallest drill bit to it that we had, and it fit perfectly through and cleared them out.

Total newbie question, where would the tank sock filter be within the tank? The petcock has that screen but otherwise I haven't seen or know of any filters internally. I actually found some particles in the inline filter I was running, but like I said, it was definitely creating flow issues, so I'm not running it anymore. I also cleaned out my tank a month ago or so, but apparently not well enough! Is it worth it to purchase that Red Kote tank coating and cleaner? My tank has little to no varnish or surface rust, maybe a couple spots the size of a penny.

I can touch both feet on the ground, just on my tippy toes haha. I'm a little worried once I get some ride time in that I'll manage to fall parking it somewhere, sometimes it's a little difficult turning it or moving it on a slight incline. Guess we'll see what happens. The side panels sit flush unlike the factory panels, I fabricated them from some spare sheet metal, wasn't a fan of the look, so I put 1" foam on them and upholstered them with heavy duty vinyl, and installed the old school Honda badges on. They're also attached via heavy duty velcro, so they're study sitting, and should be fine while riding, but I'm sure a test run will show results.

I don't think there's any rear end damage, but I'm curious if the PO ran over something, got air born for a hot second, and maybe fell off the bike after? It would explain the bent spokes in the rear, and the bent fins I have on the side. Otherwise the bike is in good condition visually. I agree, I should really get a truing stand, but at the moment I'm still catching up on a ton of other things. Financially I don't think I will be able to ride this season, maybe if I'm lucky in October I could get a run or two in?

I did compression readings recently and I freaked out over my results. Across the board, I measured 90, 80, 70, 90psi on my cylinders... Granted, this was on a harbor freight reader, and I never used it before, so I can't deem it accurate or inaccurate. Either way, it measured them at a consistently low level, so I got really upset and irrationally decided to tear the top end off, as I pulled the spark plugs and found cylinder 1 was burning oil.

Luckily (but also frustrating?) I found no visible damage anywhere on the valves, pistons, or cylinder walls. I noticed my valve seals are bad on a couple, but again, not a compression issue. There were crescent shaped rust spots where the head gasket sits on the outer areas of cylinders 1 and 4, so that definitely indicates a blown head gasket right? The gasket was seeping externally, but very minutely.

I did find one of the head studs is torn off though, a lovely surprise. I'm going to have to find a way to remove that. I'm assuming it's reverse threaded, and I don't want to tap it if I don't have to. I was thinking about welding a pipe onto the top of it, creating a T shape, and using that for leverage and freeing it from the block. Thoughts on that?

Anyways, so since I have the top end off, I definitely decided to get the Vesrah gasket kit (heard it's better than oem?) and, I also want to get the top end bead blasted and powder coated. A place I went to for an estimate quoted me $200 and also said it might be worthwhile to leave the fins unfinished and I don't really know if I like that idea at all. That price isn't including the tappet covers or any hardware, as I want to go with a stainless steel kit.

I also may be purchasing another cylinder jug soon; mine has two huge cracks in the fins by the exhaust, not to mention every corner is either bent, cut, or lightly chipped. So, I'm not sure if I want to just hone the "new" jug when I get it, or just say screw it and bore it out to a 550, get new pistons, etc. I would like to get this powder coated as well. I really wasn't looking for a power build with this project, but I don't see any reason not to at this point if I'm already in there. Side note: I have a mix of marvel mystery oil, pb blaster, and wd40 sitting in the cylinders, and cylinder 4 has virtually no mix left in it. All others are full. Does this definitively say the rings are bad on 4? Like I said, there is NO scoring anywhere. Could it just be that the ring gap is right below the pool of the mixture (bike is on the side stand) on 4 and gravity is just working it's magic?

It was also only at the point of total removal that I realized timing could be the main culprit.. We static timed the points.. but I totally forgot to time the bike itself.. So mad at myself but lesson is learned.. I guess in a way it gives me peace of mind knowing the internals are decent. If I had just timed the bike, I probably would have been on the road by now...
« Last Edit: February 16, 2019, 08:19:58 PM by Marissa »
1984 Nissan 300zx - sold
2016 Ford Fiesta ST - daily
1972 Honda CB500 - infinite work in progress

Instagram- marissasimos

Offline DaveBarbier

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Re: Marissa's 1972 CB500
« Reply #43 on: July 22, 2017, 04:48:02 AM »
Looks like Cal's got you covered :)

Regarding the possible upgrade, an entire 550 motor will drop in to your frame. Might be cheaper to find a running motor with a crap frame somewhere (actually may be hard in CT) and just drop it in your frame. Price of new cylinders plus pistons and machine work...you decide.

Vesrah is not better than OEM. OEM is best but Vesrah is widely used on the forum so it's not bad. Generally, OEM is best for everything on the bike. The Vesrah kit you got probably doesn't come with the rubber puck sealing washers that go over the head nuts. Get OEM pucks. OR if the kit has them, measure the thickness and the depth of the seat and be sure they'll sit about 40 thousandths proud. Sometimes aftermarket rubber parts aren't the right size.

Quote from Hondaman from this post: http://forums.sohc4.net/index.php/topic,122379.msg1438727.html#msg1438727
Quote
First, check the step depth of the head hole. Then, check the thickness of your seal. You need at LEAST .030" compression, .040" is better. The too-thin ones are only about .005" thicker, which won't seal when the head heats up and the hole becomes deeper.

What I would do, use this site: https://www.cmsnl.com/honda-cb500k1-four-1972-usa_model460/partslist/ to tell what the size of a given o-ring is, then compare it to the one you have from the kit. Mainly for the o-rings that go between the cylinders and case where the oil jets are (not sure if you're in that far) and the o-rings that go between the cylinders and the head on the outsides. That is a common place for leaks in these motors. Too small or too large of an o-ring isn't good.

Hope that helps!


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Offline SOHC4 Cafe Racer Fan

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Re: Marissa's 1972 CB500
« Reply #44 on: July 22, 2017, 09:30:28 AM »
What I would do, use this site: https://www.cmsnl.com/honda-cb500k1-four-1972-usa_model460/partslist/ to tell what the size of a given o-ring is, then compare it to the one you have from the kit. Mainly for the o-rings that go between the cylinders and case where the oil jets are (not sure if you're in that far) and the o-rings that go between the cylinders and the head on the outsides. That is a common place for leaks in these motors. Too small or too large of an o-ring isn't good.

CMSNL is a great source as well as the parts fiche to figure out parts specifications and part numbers.  Their parts and shipping prices are on the higher side.  David Silver Spares is also a good source, but make sure you are ordering (if you do) from the USA website and not the UK site.  They all ship from the same place, but the UK site charges you more for shipping. 
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)

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2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
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Offline Camrector

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Re: Marissa's 1972 CB500
« Reply #45 on: July 22, 2017, 09:40:16 AM »
Remember open motor = open wallet.
Cruzin image 605 kit and a cb650 cam swap with some mild porting really wakes these motors up, and keeps the money under control.
Hondaman has some experienced things to say about painting fins.

Offline RAFster122s

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Re: Marissa's 1972 CB500
« Reply #46 on: July 22, 2017, 10:21:42 AM »
Unless they closed the US address, they will ship from US on parts orders where they have stock.  If they are missing a piece from order they may choose to ship from the other site because the shipping costs from both locations pushes any advantage from shipping in USA out the door...so, cheaper to ship from the NL location at that point.

It would be interesting to see the shipping costs vs charged amounts for a year...that loss could influence a hike in shipping, etc. I am sure they would be looking at those figures.  There comes a price point where you will consider going elsewhere with your order if the cost is perceived as being too high.  The company might take a small hit on shipping at a loss when their sales volume more than makes up for that small loss.

Definitely support the USA warehouse if in US as it keeps it in business.

David
 



What I would do, use this site: https://www.cmsnl.com/honda-cb500k1-four-1972-usa_model460/partslist/ to tell what the size of a given o-ring is, then compare it to the one you have from the kit. Mainly for the o-rings that go between the cylinders and case where the oil jets are (not sure if you're in that far) and the o-rings that go between the cylinders and the head on the outsides. That is a common place for leaks in these motors. Too small or too large of an o-ring isn't good.

CMSNL is a great source as well as the parts fiche to figure out parts specifications and part numbers.  Their parts and shipping prices are on the higher side.  David Silver Spares is also a good source, but make sure you are ordering (if you do) from the USA website and not the UK site.  They all ship from the same place, but the UK site charges you more for shipping. 
David- back in the desert SW!

Offline Marissa

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Re: Marissa's 1972 CB500
« Reply #47 on: August 15, 2017, 06:15:20 PM »
Disassembled further to see if there's any other evidence of damage.

The connecting rod definitely is not supposed to look that dry/dirty... right?

While the cylinder jugs are definitely stained, I don't think they have any significant scoring. I have yet to measure the piston rings to see if they are out of spec; but to my surprise every single one of them spun freely. Even the bottom set spun. I'm dumbfounded. I would assume if the gapping is too significant on the rings, they would score, correct? Could it be possible the rings are seating too much inward and letting blow by occur, thus affecting compression poorly and leaving no signs on the cylinder walls?

This wall was my biggest concern, though off the top of my head I don't remember if I could feel that residue or not. I haven't worked on the bike in a month and I just got back from vacation so I'm a bit foggy.

I sent the top end to a shop to have it inspected and new valve seals installed, they said everything looks to be in tip top shape, which is helpful but I was hoping the valve seals would be the culprit. I guess I'll verify tomorrow whether or not they were including the condition of the valve seals in it as well.

I just want to ride. Shame on me for getting myself into this mess haha. I should have just waited longer for a running bike.
« Last Edit: February 16, 2019, 08:25:27 PM by Marissa »
1984 Nissan 300zx - sold
2016 Ford Fiesta ST - daily
1972 Honda CB500 - infinite work in progress

Instagram- marissasimos

Offline Marissa

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Re: Marissa's 1972 CB500
« Reply #48 on: August 15, 2017, 06:22:45 PM »
Also, do you guys recommend replacing all of the head studs instead of just R&Ring that broken one? I'm in the mindset of "Already spent too much, might as well take extra time and money to make sure it's done right"
and don't want to skip any parts I might unintentionally.

Which also leads me to the question of: what do you guys recommend to do when the original paint on the engine is dirty and in rough shape, and every place I've talked to does not recommend to powder coat it because of the heat soaking issues? Do most of you just use as spray can engine enamel? Do you guys leave it bare? I've tried aircraft remover, the orange gel paint stripper, paint thinner, sanding, soaking it for days and it doesn't do a bit of removal on the paint. Is it worth it just to get it hot tanked and leave it bare?

Thanks in advance.
1984 Nissan 300zx - sold
2016 Ford Fiesta ST - daily
1972 Honda CB500 - infinite work in progress

Instagram- marissasimos

Offline Stev-o

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Re: Marissa's 1972 CB500
« Reply #49 on: August 15, 2017, 06:41:19 PM »
The connecting rods appear to have surface rust, most likely from moist in the motor when it sat.  That should clean up, try WD-40 and very fine steel wool. 

Remove the Pistons and take them and the cylinders to a competent machine shop for proper measuring. 
You might get lucky amd only need a hone and new rings. 

Personally, I would just replace the 1 broken stud, your not building a race motor, right?


The engine cases came from Honda painted, with a thorough cleaning and sanding where necessary, they can can be rattle canned with VHT Aluminum and look like new!

BTW - I've been through this twice in the last year, it can be frustrating but very satisfying when complete. 
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........