Vintage and Classic Hondas

Reinstalling cam exhaust chain and sprocket - help needed

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lusciouslemur

Reinstalling cam exhaust chain and sprocket - help needed

Hello all.
Got a 1980 cb750c.

Essentially I'm in the middle of putting the cam shafts back in place, but there seems to be absolutely no slack on the chain to make this possible. I can either get the chain on the sprocket or attach the sprocket to the shaft, but not both. I've tried getting as much as I can out of the rear tensioner. Am I missing something, should it be this hard?

TOOLS1

Re: Reinstalling cam exhaust chain and sprocket - help needed

Administrator

There is not much slack in the chain to start with, so it can be troublesome. Are you putting the chain on the sprocket and then putting the sprocket on the cam? If you install the sprocket on the cam first, you will never get the chain on.
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1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
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lusciouslemur

Re: Reinstalling cam exhaust chain and sprocket - help needed

Chain on sprocket first. It looks like there's a lip in front of where you bolt the sprocket on, having trouble getting it close enough to start putting the bolts in.

TOOLS1

Re: Reinstalling cam exhaust chain and sprocket - help needed

Administrator

It should slide up on that lip.

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Rodgil

Re: Reinstalling cam exhaust chain and sprocket - help needed

In reply to this post by lusciouslemur

I had a the same problem recently on my 1982 DOHC. I was able to feed the camshaft through the sprocket, then fit the chain and lastly fit the bolts. Hope this works for you.

1982 CB750F
1978 Triumph Tiger 750
197? Yamaha DT175
197? Hodaka ACE 100

shinyribs

Re: Reinstalling cam exhaust chain and sprocket - help needed

Administrator

In reply to this post by lusciouslemur

lusciouslemur wrote

Hello all.
Got a 1980 cb750c.

Essentially I'm in the middle of putting the cam shafts back in place, but there seems to be absolutely no slack on the chain to make this possible. I can either get the chain on the sprocket or attach the sprocket to the shaft, but not both. I've tried getting as much as I can out of the rear tensioner. Am I missing something, should it be this hard?

Are you reusing a preexisting chain, or installing a new one? If new, verify the length/pitch of the chain is correct.

lusciouslemur

Re: Reinstalling cam exhaust chain and sprocket - help needed

Same chain. I don't know how it was on there to begin with because even with the tensioner slackened out there's no way I'm able to get the sprocket on there.

lusciouslemur

Re: Reinstalling cam exhaust chain and sprocket - help needed

Well, for whatever reason I got it on by installing the sprocket first and yanking the heck out if the tensioner first. Thanks all for the advice!