SOHC.co.uk Forums > CB650

Is this normal chain wear?

<< < (5/7) > >>

Bryanj:
I have only ever done one 650 and memory tells me the chain looked like the one in the pic with the outer side lates holding the chain onto the gears.
Similarly i have only ever seen that type of wear in cylinders once and that was on a 750 serviced by the owner who did not understand how the camchain tensioner worked and thought he followed the procedure in a spurious manual but didnt and the camchain managed to eat a hole in the block oil leaked out of

SumpMagnet:
that hyvo chain does not look a good fit on the sprocket. With the chain sitting on a tooth....how much of a side to side gap is there? Hard to tell by eye.... but I wonder if the chain just wasn;t the right part and sort of fitted.

Must have made a fair bit of noise when it was started up like that, until it wore a channel in the tunnel. I've seen worn tensioners and guides, and fore/aft slop leading to rattly cam chains, but never had one that chewed its way sideways.

I'd be replacing the chain and tensioner, after cleaning out the bottom end to get rid of the swarf.

I also think that cam looks worn ....

Veedunk:
Thanks again for everyone’s input here, it really is much appreciated but a little overwhelming at the same time!

I’ve put the chain on the sprocket, I would say there is about 1.5mm give or take of movement side to side…it doesn’t feel like a tight fit and quite loose on the sprocket teeth. Also, I’ve checked the David Silver website and they list a cam chain which looks different to mine, more like the one in the link posted by K2-K6, so I’m pretty sure it’s got the wrong chain fitted.

Very occasionally and only when starting from cold would I get any rattling from the engine, more like a single slap and then the noise would stop straight away and I never gave it any more thought as the engine ran fine.

As for the cam being worn, is there any way to check? It does feel slightly uneven over the lobe with a slight ridge on one side.

Cheers

Nurse Julie:
That cam is definitely worn, you can see it. 2 choices, find a good used replacement cam or send it to Newman Cams for building up and re profiling. The 1st option will by far be the cheapest option.

Veedunk:
I’ve tried a few suppliers today but not had any luck finding a camshaft either new or secondhand. They are obviously quite a rare item.
It looks like I will get it re-built unless anyone has a spare camshaft lying around in the shed??

Navigation

[0] Message Index

[#] Next page

[*] Previous page