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The Vintage Japanese Motorcycle Owners Group: Discussion Forums

Vintage Japanese Motorcycle Owners Group :: View topic - '73 CL100 fix-up


'73 CL100 fix-up
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spurlock
Commuter
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Joined: Jul 08, 2014
Posts: 935
Location: Vacaville, CA

PostPosted: Wed Jan 31, 2018 6:45 pm    Post subject: Reply with quote

That sounds like a bit of cloth like a piece of grease rag got left in the engine at some point. Hopefully none of the fibers have clogged the small oil jets in the right crankcase near the right rear cylinder stud that feed the transmission and top end. Personally I would pull the right side cover again and check those, and also disassemble the oil pump to check for contamination. The stakes are too high to risk crud floating through the lubrication system. And definitely check the screen a couple more times. Better safe than sorry!

-Bill

_________________
1975 Honda CB125S
1989 Honda NX250
1989 Honda GB500tt
1989 Honda CB-1
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dgjessing
Weekend Warrior
Weekend Warrior


Joined: Aug 11, 2017
Posts: 116
Location: Columbus, OH

PostPosted: Thu Feb 01, 2018 4:01 pm    Post subject: Reply with quote

I think I blew out all the passages pretty well (knock on wood). We'll keep a close eye on the screen and the oil in the spring.

Next up is the front fork. Oh, and I know what's causing the rattle in the speedo - one or more of the tubes above the indicator lights are loose. I'm hoping that I'll be able to get some epoxy in there to tighten things up.

Here's as pretty as the engine is going to get:



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dgjessing
Weekend Warrior
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Joined: Aug 11, 2017
Posts: 116
Location: Columbus, OH

PostPosted: Sat Feb 10, 2018 2:42 pm    Post subject: Reply with quote

I've got a couple little hairline cracks in the plastic headlight bucket. I just now rubbed a little styrene glue on a spot inside to see if it effected the plastic at all, and it didn't. The stuff almost looks like nylon. Does anyone know what sort of process (glue, heat, or whatever) is best to repair this stuff?
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dgjessing
Weekend Warrior
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Joined: Aug 11, 2017
Posts: 116
Location: Columbus, OH

PostPosted: Sat Feb 10, 2018 5:05 pm    Post subject: Reply with quote

Head stock bearings feel a little "notchy". Glad I'm taking the thing apart to see what's up.

Edit: "knotchy" ? Whatever Smile
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spurlock
Commuter
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Joined: Jul 08, 2014
Posts: 935
Location: Vacaville, CA

PostPosted: Sat Feb 10, 2018 5:34 pm    Post subject: Reply with quote

dgjessing wrote:
I've got a couple little hairline cracks in the plastic headlight bucket. I just now rubbed a little styrene glue on a spot inside to see if it effected the plastic at all, and it didn't. The stuff almost looks like nylon. Does anyone know what sort of process (glue, heat, or whatever) is best to repair this stuff?


My default plastic repair is to rough up the inside of the crack with a Dremel or small sanding drum, then warm the surface with a heat gun and spread some paste type epoxy, lay on a strip of fiberglass cloth, then more epoxy to saturate the cloth. If your epoxy is fairly stiff, finish by heating the repair with a heat gun to make sure the epoxy flows into any voids, then let it cure. Various plastic repair products are out there, such as PlastiFix but I just use epoxy/fiberglass because I'm used to working with it and have had good success.

-Bill

_________________
1975 Honda CB125S
1989 Honda NX250
1989 Honda GB500tt
1989 Honda CB-1
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spurlock
Commuter
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Joined: Jul 08, 2014
Posts: 935
Location: Vacaville, CA

PostPosted: Sat Feb 10, 2018 5:41 pm    Post subject: Reply with quote

dgjessing wrote:
Head stock bearings feel a little "notchy". Glad I'm taking the thing apart to see what's up.

Edit: "knotchy" ? Whatever Smile


Yeah, that's fairly common on those bikes. The bearing races get indentations, probably because they never get adjusted after initial settling and end up with clearance which pounds them. The balls and races should still be available from Honda, and having new ones correctly adjusted really helps the handling. Good luck,

-Bill

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1975 Honda CB125S
1989 Honda NX250
1989 Honda GB500tt
1989 Honda CB-1
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dgjessing
Weekend Warrior
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Joined: Aug 11, 2017
Posts: 116
Location: Columbus, OH

PostPosted: Mon Feb 12, 2018 12:54 pm    Post subject: Reply with quote

The lower bearing is trashed, upper looks OK. New parts on the way.

Fork legs are in pretty nasty shape in spots (see picture). I'm just going to polish them and put it back together though - we're already way over budget on this thing Smile. I WILL make sure the tubes are turned so that the rough spots are facing inwards - it can start over wearing out in different spots. New seals and rubber gaiters on the way.



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spurlock
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Location: Vacaville, CA

PostPosted: Mon Feb 12, 2018 1:01 pm    Post subject: Reply with quote

Yeow, those fork tubes are likely to eat your new seals in short order. You might want to find a shop that does hydraulic cylinder repair and get an estimate for replating with hard chrome.

-Bill

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1975 Honda CB125S
1989 Honda NX250
1989 Honda GB500tt
1989 Honda CB-1
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dgjessing
Weekend Warrior
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Joined: Aug 11, 2017
Posts: 116
Location: Columbus, OH

PostPosted: Mon Feb 12, 2018 1:17 pm    Post subject: Reply with quote

spurlock wrote:
Yeow, those fork tubes are likely to eat your new seals in short order. You might want to find a shop that does hydraulic cylinder repair and get an estimate for replating with hard chrome.

-Bill


Nah - way over budget. Whoever restores it next time can do that Smile. I'll just get used to wiping oil off the things.
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dgjessing
Weekend Warrior
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Joined: Aug 11, 2017
Posts: 116
Location: Columbus, OH

PostPosted: Tue Feb 13, 2018 4:17 pm    Post subject: Reply with quote

Waiting for parts to arrive, I've done some little stuff. Polished the top of the triple tree, and sprayed "chrome" paint on the rusty insides of the headlight brackets. I've also repaired the cracks in the headlight bucket with epoxy & some fibreglas cloth I had laying around, as advised Smile. The repaired item is in the paint booth now. I know it's supposed to be black, but I'm doing it dark blue to match the side covers instead, because why not?

I was wrong about the rattle in the speedometer - it's actually the drive dog (the thing the cable mates with) moving back and forth a tiny bit. Shake it with that loose and I get the noise, hold the dog tight with a nail or something and no noise. Not sure what the solution is. It looks like the thing can't be disassembled, so I'm thinking about a spacer of some sort at the end of the cable to take up the slack. I dunno...



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dgjessing
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PostPosted: Fri Feb 16, 2018 12:12 pm    Post subject: Reply with quote

I think I've fixed the rattle in the speedometer with a very light spring and the perfect size nylon washer. Assembled it spins freely and does not rattle. Of course I won't know for sure until I ride it again, but I think I've got it.


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dgjessing
Weekend Warrior
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Joined: Aug 11, 2017
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Location: Columbus, OH

PostPosted: Sat Feb 17, 2018 7:22 am    Post subject: Reply with quote

Parts arrived. I've got the headstock bearings in and the fork seals replaced. Hope to put everything back together this afternoon / tomorrow. Doesn't look there is going to be a break in the rain till maybe tuesday afternoon though Sad
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dgjessing
Weekend Warrior
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Joined: Aug 11, 2017
Posts: 116
Location: Columbus, OH

PostPosted: Sun Feb 18, 2018 2:14 pm    Post subject: Reply with quote

Alright, this thing is pretty much done Smile. I think the blue headlight looks good. I've got an occasional rattle in the exhaust heat shield (I think) but other than that, it's ready. Too cold to ride much today, but it's looking good Tuesday. If so I'll do around fifty miles then drain the oil & clean the screen again. Hopefully that'll do it!


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Lotus54
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Joined: Feb 18, 2018
Posts: 3

PostPosted: Sun Feb 18, 2018 5:49 pm    Post subject: Reply with quote

Fun seeing you fix up the old bike.

I just picked up a 72 CL100, Looks to be almost completely original- even the tyres.
I’m going to clean it up, get everything up to snuff. But not restore. I think keep it original as possible.

So far- I can’t put up a picture.


Last edited by Lotus54 on Mon Feb 19, 2018 9:49 am; edited 1 time in total
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Lotus54
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Joined: Feb 18, 2018
Posts: 3

PostPosted: Sun Feb 18, 2018 9:14 pm    Post subject: Reply with quote

I tried from desktop and seems to allow me to attach ok. Sorry for the huge size


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Last edited by Lotus54 on Mon Feb 19, 2018 9:45 am; edited 1 time in total
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