SOHC.co.uk Forums > CB500/550

Cam chain tensioner

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Murf:
The tensioner I have is knackered, the tensioner pad has wear and cracks and the tensioner arm had not been fitted correctly, it wasn’t in the pocket in the crank case. It has wear marks at the bottom which look looks like it was catching on the primary drive chain.  The Drive chain looks undamaged.
Silvers have complete tensioner for around £145 +  but I have seen just the pad part for around £50, what are your views on these options? Also is the original tensioner arm, not pad, even reusable due to the damage.
I realise that fine metal particles from this damage could have circulated around the engine in the oil, which I am not happy about but don’t want to strip and rebuild the bottom end.

I had the sump off when I first got the bike, it looks like it has been off and cleaned in the past, there was a small deposit in the sump under where the tensioner was catching the chain.  I didn’t take much notice as I didn’t know of the problem at that point. The mesh oil pick up screen was very clean.  I have attached Photo to try and show damage.

Bryanj:
That is bent due to incorrect fitting, you can, if lucky, straighten it but you need one to compare it to, put up a pic of the slipper for advice, getting a used tensioner is unlikely, i will be stripping a couple of 550 sometime in the next 6 months but no idea of condition

davidcumbria:
I bought an aftermarket tensioner blade from Cmsl - it seemed more flexible than the original but that could be due to heat hardening of the ( slightly cracked ) original. It’s a critical area on these bikes and if I had my time over I would splurge on a new complete oem unit to be sure that chain noise is minimised after all the rebuild effort, though for now at least it’s quiet on mine. Primary chain is reputed to be the source of a lot of noise.

Bryanj:
Is this a 500 or 550?

McCabe-Thiele (Ted):
550K1  looking at earlier posts.

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