SOHC.co.uk Forums > CB500/550
camchain tensioner
bigmockuk:
was so sure i`d find somethingoutof place upthe top end like a damaged rocker shaft or valve spring but found nothing,so this noise must be resonating upwards from down below and the only thing i can think of is the tensioner rubber at the bottom,as the camchain is moving round the tight spot that a chain has must be pushing the tensioner against the groove it located in and resulting in the tapping sound so thats the next job,hopefully get that done before the weather changes in the next few days :)
exvalvesetdabbler:
I have been following your thread with interest. It occured to me earlier today and I remembered watching a video some time ago where a 400 four rebuild was giving similar noises.
In that instance the guy had used a reground cam and the old followers. Because of the mismatch in wear the rocket arm was slapping sideways on first contact and sounding like a loose tappet. I think a slowed down video confirmed it.
I guess the same could happen if the rockers end up in a different position after a rebuild.
It's on you tube somewhere.
Edit. Found it about 14 minutes in
https://youtu.be/k3qBLW_sYD8?si=LLzgM481N7aTsw_j
Regards
Dave
Sesman:
That was superbike surgery. Twas a 400 four.
Murf:
Just a thought, it’s not the primary chain that is worn and slapping is it, you can see cut marks on the oil gallery cast in the crankcase if the chain is slack. (Sump plate off looking up)
Is the pad on the tensioner in good condition.
Is the cam chain guide in position and ok.
Do you slacken off all the tappet adjusters and back the screws out before fitting the rocker box back to the head, then reset them all.
Bryanj:
550 primary does not hit casing as much as 500
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