Author Topic: Frame-up cb350f restoration, hunk o' junk transformation  (Read 55903 times)

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Offline grcamna2

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #100 on: February 17, 2016, 05:32:40 PM »
What size countershaft sprocket will you be running Mark ?
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Offline markreimer

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #101 on: February 18, 2016, 05:10:42 PM »
Hmm well hit my first snag.. 400f right side peg hits the brake pedal pivot shaft.


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Online seanbarney41

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #102 on: February 18, 2016, 05:19:00 PM »
the crowd starts to chant..."Die Grinder Die Grinder Die Grinder Die..." ;D
If it works good, it looks good...

Offline markreimer

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #103 on: February 18, 2016, 09:33:03 PM »
Haha there might have been a little bit of that tonight...


So overall I didn't get the bike on the road like I had hoped tonight. I had to first help fix my dads 25 year old Honda snowblower. With that outta the way, it was back to the 350.

The pegs were first up. Left side mounted easy. Didn't take much fussing to get the shifter linkage working, just a simple matter of picking the right angle on the splines and adjusting the threaded rod for optimal lever angle.

The right side was tricky... The 350 brake pivot and spring isn't quite the same as on the 400, so I couldn't get the peg to mount flush to the frame. I used a spacer to shim it out a bit, retaining about half of the engagement on the post that prevents the leg from rotating under weight. This allowed the org to sit just off the brake lever.

However the right side peg had a stupid spring steel spring, as you can see in the previous post. The left side has a traditional wound spring. When the right side peg lifts up, the spring steel protrudes outward and into the brake lever, and is pried off the peg, flying across the shop. I realized when I was leaving that the 350 peg is an identical design where it pivots, but uses a regular spring just like the 400 left peg. I'll swap them next time I'm in the shop. That will allow the peg to smoothly lift up and spring back down without obstructing the brake pedal. All in all I've got pegs on and it shifts and brakes now. Sweet!

The kick start will not work at all. It smacks the peg after the first push. I'm not even sure how the 500f (550f?) is supposed to solve this.

I check led the sprocket and chain count as suggested. I'm running 96 links with 17/38 sprockets. The rear looks really good. The front has a bit of shark toothing. I have a great 530 o-ring chain still in the box, but no master link. I'll order that up and use it. I test fit it and there is ample clearance all around. Nice little cost saving there.

Next was the clutch. This one stumps me. The lever is a bear to pull. I replaced the cable with a new one and first tried it with the tank off, cable routed with no sharp bends at all. Still so hard. Ok, so it's not the cable routing or cable I guess. I pulled the cover any it looked quite pristine in there. The lifter mechanism was clean and very smooth by hand. I took the basket apart and the plates were very stuck together. Hmm maybe onto something here. I couldn't rotate the basket by hand with the springs removed. After pulling the plates apart and reassembling it was possible to rotate the basket, but not easy. I bolted it all back up, tried the lever, still super stiff. Could it just be the 40 year old plates are sticky and need to be run in a bit? I'm wondering if a good bath in hot oil and dragging the clutch a bit would return them to normal. If not, I'm stumped.

Oh, then I discovered the steering stop has been snapped off. That explains the dent in the tank... Shouldn't be hard to weld a tab on there. Or maybe just drill, tap and put a bolt in or something

Last job of the night was the tach electrical. Wiring to the bulbs was ripped up, so I cut it out and replaced. Still haven't opened the tach up to check the oil damper though. Soon...



So, new sprocket, master link, used kick start lever, clean up the tach inside, and we'll see if this girl is ready to ride.




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Offline jonda500

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #104 on: February 19, 2016, 05:50:38 AM »
The 400-4 right footpeg is different because when kickstarting the 400-4 you need to fold up the peg out of the way first...
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Offline markreimer

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #105 on: February 19, 2016, 06:07:33 AM »
Ahhh, I see! So a regular spring wouldn't be ideal then, unless there was some way of holding the peg in the upright position. Hmm... Ok, time to think.


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Offline knowsnothing

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #106 on: February 19, 2016, 09:03:11 AM »
Hmm well hit my first snag.. 400f right side peg hits the brake pedal pivot shaft.


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I ran into the same problem.  Still haven't found a solution, but I was thinking i could thin the end of the brake pedal, shim the back side of the shaft and shim the foot pedal out a bit.  That would hopefully have enough clearance to fold the peg up and have the kicker go around it.  I have also heard the kick pedal from a 500/550 (don't remember which one exactly) is wider and allows more clearance. 
1978 CB750k Green - 811 engine
1978 CB750k Blue - for sale
1974 CB375F Faded Black - had to have that 6th gear
1976 CB400F Red - in many pieces
1973 CB350F TBD - in many pieces

Offline knowsnothing

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #107 on: February 19, 2016, 09:05:14 AM »
The other option is to just take the kicker off.  These bikes are easy enough to bump start.  Don't ask me how i know  >:(
1978 CB750k Green - 811 engine
1978 CB750k Blue - for sale
1974 CB375F Faded Black - had to have that 6th gear
1976 CB400F Red - in many pieces
1973 CB350F TBD - in many pieces

Offline markreimer

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #108 on: February 19, 2016, 09:10:44 AM »
I shimmed the pedal out as far as I felt comfortable doing. Any more and it could rotate under weight, or I'd simply run out of threads on the mounting rod.


I filed just the back corner tip of the peg that hit the brake pedal. This allows it to fold up, but doesn't solve the spring issue. The spring pops off because it's pried off by the pedal interference. I may have to do something a bit cumbersome like  replace the spring with a regular one (like the left peg) and create some kind of strap or fixture that holds the peg up and out of the way for kickstarting.

The kick lever that people suggest is the 500f/550f. I'm hunting for a used on now. No way could the stock lever ever work with these pegs


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Offline markreimer

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #109 on: February 28, 2016, 01:52:24 PM »
Good news and bad news!!

Bad news is.... My frame is cracked. Lol. Right under the sprocket. Looks like it had some compression force and the tube expanded just slightly, causing the tube to split. It's about 1cm long and 1mm wide. I pushed the bulge back in with a c clamp which closed the crack. It's obviously easy to weld back up, but the thing is... Welded frames won't pass safety inspections here. Soooo I gotta make this weld real clean, file it smooth, and paint that part of the frame so they don't find it. The good thing is, the whole frame has like-new paint everywhere but this spot, so new paint shouldn't stick out much. We'll see. If it still fails inspection, I have a spare frame I can move this all over to. What a drag!



The good news is, I went for a ride!

I put the new sprocket and chain on, opened the door and said screw it! Snow or no snow I'm riding. It was ultra slippery but still fun!

I have a welder friend who says he can repair, smooth and paint that section with me on Thursday. So... Next update will be with repair details.





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« Last Edit: February 28, 2016, 02:00:56 PM by markreimer »

Offline calj737

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #110 on: February 28, 2016, 05:34:54 PM »
Looks like water infiltrated your frame, then froze and expanded to blow that hole open.
'74 550 Build http://forums.sohc4.net/index.php?topic=126401.0
'73 500 Build http://forums.sohc4.net/index.php?topic=132935.0

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Offline sbeckman7

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #111 on: March 01, 2016, 12:41:06 PM »
Beautiful riding conditions  ;D

Offline carnivorous chicken

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #112 on: March 01, 2016, 06:20:37 PM »
A cb550f pedal will clear the pegs. Must be 550f, not 550k or 500F.
I've ditched the spring in the right peg on some bikes -- the fact that it sits against the brake lever means that it stays up when you need to kick it. I've also cut a little of the rear brake mounting tube on the peg side and move it over to the inside (watching out for clearance with the tire) to give a little more space there.
Kickstands on 350Fs but especially 400Fs can be flimsy and give way -- I've seen holes in frame because the kickstand gave out, but doesn't look like that's what's going on here.
« Last Edit: March 01, 2016, 06:29:59 PM by carnivorous chicken »

Offline markreimer

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #113 on: March 02, 2016, 12:52:03 PM »
Beautiful riding conditions  ;D
-26C the day after I took this video!!

Thanks for the tip on cutting the brake tube. Not a bad idea at all. I'm still hunting for a kick start from a 550F. Tough part to find it seems.

I know that this bike was dropped on the left side in it's 'past life' as the engine covers are scratched up, fender was bent, headlight bracket was cracked, etc... so this could be related to that. But it also sat outside for 40 years soo... who knows. Tomorrow evening it's welding night. AND the forecast for the weekend is above freezing. More test rides!

Offline markreimer

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #114 on: March 04, 2016, 07:46:15 AM »
Progress last night on the frame crack. I brought it over to my buddy jeff's place (he's the guy who gave me the parts bike in the first post) for welding. While loading the bike into the truck bed my ramps slipped and the bike fell half off the truck. Close call, but no damage!

I brought it home to clean up and prep for paint. I ground off too much weld and discovered a tiny pinhole, doh! I'll probably just bondo it and paint though. It's a massive pain trucking this bike around and that pinhole isn't adding or costing any strength.

Tomorrow, paint! 


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Offline grcamna2

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #115 on: March 04, 2016, 08:18:14 AM »
I would remove the engine and have that done good similar to what Sbeckman7 did to his,that way you're 'Good to Go' for many years and won't have/give a problem somewhere down the road to you or someone else that leaves it outside or may ride through the rain too many times..  :-[
75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline txdrifter05

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #116 on: March 04, 2016, 08:19:29 AM »
Im sure you have realized this by now, but your turn signals are wired backwards. the left front came on with the right rear. Im not criticizing, just noticed it. lol

Offline jamesv220820

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #117 on: March 04, 2016, 08:25:04 AM »
keep me posted on your kick starter dilemma. I have a CB350F with CB400f foot pegs, rear brake pedal, and rear set.  I also have the same problem. I am not sure if this 550 kickstarter will work. I can never find one in great shape to try out.
There is nothing to fear but fear itself . . . and trying to restore a cb350f

Offline markreimer

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #118 on: March 04, 2016, 08:26:19 AM »
Yeah, that is absolutely a good idea in the long run. My primary concern right now is getting through the safety inspection process, and the less tampering with the frame the easier it is to make it through that ordeal. Once that's done, I've got zero issues with a more substantial repair job.


re: kick - will do. I've been hunting eBay and posting wanted ads. Hard part to find. I might have to make my own or something.

Offline txdrifter05

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #119 on: March 04, 2016, 08:32:20 AM »
I would also recommend a coating inside the tubing in the repair area. Corrosion can happen in there too.... (Don't ask me how I know that) check out KBS coatings, they might have a solution for that. Regarding the foot pegs, if you are still in need of them, I have the stock pegs from 3 different bikes. A 74 CB550F, 73 350f, and 72 SL350 twin. Id be willing to give them to you if you want to pay for the shipping. Just an idea. Im not planning on using any of them. Also there is a website called mcsspecialties that sells all different makes of used parts. The guy buys old bikes and sells the good parts. Pretty cheap too. I bought a CB550 seat for 20 dollars plus shipping. Worth a look IMO.

Good job on the bike btw. Looking pretty good!

Offline carnivorous chicken

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #120 on: March 04, 2016, 09:44:44 AM »
CB550F will absolutely work -- I've done it with a few bikes over the years.

Offline jamesv220820

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #121 on: March 04, 2016, 09:54:36 AM »
CB550F will absolutely work -- I've done it with a few bikes over the years.

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There is nothing to fear but fear itself . . . and trying to restore a cb350f

Offline carnivorous chicken

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #122 on: March 04, 2016, 10:43:46 AM »
CB550F will absolutely work -- I've done it with a few bikes over the years.

Sheeeiiittt... I'm working in ABQ, away from my 350F. Might be able to get my ex to send me a photo of the one I built for her! But if there's some doubt, maybe we can make a little friendly wager first?

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Offline markreimer

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #123 on: March 05, 2016, 07:02:45 PM »
Great parts site tip, thanks! My pegs are working well now. I did a bit of modification to the brake and peg and everything is ship shape. I also cleaned up the frame repair and painted. I used vht gloss and it blended right in.

I've used fluid film inside steel bicycle frames for rust prevention with great success. They get way more water in them than my motos ever do, considering they're my winter transportation. That's a good idea to coat the inside.

so today I did the frame repair and paint, brake pedal and peg mods, also replaced my fuel line after it started leaking at the carbs (too large and no hose clamp), repaired some wiring stuff I found, and installed some reflectors for the safety inspection. As far as I can tell it will now pass. I'll try to do that this week. Once it passes, I have much more freedom to modify, repair and customize as required.


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Offline jamesv220820

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #124 on: March 06, 2016, 01:05:06 AM »
looking good. Keep it up!
There is nothing to fear but fear itself . . . and trying to restore a cb350f