SOHC.co.uk Forums > CB350/400

fitting the camshaft or not!

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Trigger:
I would check the amount of links. I few months ago I had a 500 four cam chain that would not go on the sprocket, I started to doubt myself as I build engines all day long. The chain on the 500 is 88 links but, this fresh out of the box chain only had 84 when the box had 88 clearly printed.

mike the bike:
That's a bastard - having to strip down the engine because of a dodgy camchain.  It's worth checking though.  I would put a tippex mark on a link and start counting.  I presume you've still got the old one for comparison.

billdn:
Well I've counted the links or more precisely the side plates that join the links, an old cam chain gives 41 and the one fitted has 41 too.the old chain wasn't fitted but was bought as part of a job lot of 400/4 bits so i assume was a chain for this model. (i know assume nothing!) but all the other bits are so i feel fairly confident it is. i then ensured the head was fully torqued down. the cam sprocket has 32 teeth and matches the other spare sprockets i have in width and hole positions. the cam shaft is the same as the other spare camshafts (all marked R5- if that means anything.) i have taken some photos of the offending article and as can be seen it won't go in BUT won't come out either. i'm considering cutting the sprocket off but shards of metal dropping in the internals fill me with dread. any thoughts would be appreciated.

petermigreen:
In your second image, it looks like the hole in the centre of the sprocket, obviously the one the cam shaft fits through, is not a circle but oval. Is it possible to hold the shaft while you rotate the engine to get the higher part of the hole uppermost and thereby giving you more play?
Peter.

Johnwebley:
I know I had issues fitting my cam after a topend rebuild,although this is a 500,

I had to unmount the chain from the cam sprocket ,and rest the cam in the bearings,the center hole in the sprocket is eccentric,,so
it can allow enough slack in the chain to then engage the chain,and fit to the cam,

sorry I can't completely remember how I did it,
hope this helps

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