SOHC.co.uk Forums > CB350/400

Post Mortem needed for a Mr. Cam Sprocket please!

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470four:
Had this fitted to a 400/4 camshaft I bought off ebay some weeks back - the cam is fine, the sprocket is a little worse for wear...



Needless to say the chain has been jumping the teeth to a large extent! On say a rear drivechain sprocket this is easily do-able by the mechanically unsympathetic - surely on a cam sprocket it would only jump a few before mechanical carnage ensued between pistons & valves, stopping the engine?

My only guess is that the owner had run a presumably very noisy loose camchain for quite a while, running the sprocket teeth into needlepoints before it finally slipped round, taking the tops off?

Your thoughts:   :)

mick:
I think he got his money worth out of that   :o

Bryanj:
VERY worn and neglected chain and yes the valves should have hit the pistons---have you removed them and spun them in the guides to check?

Spitfire:
That is very nasty, must have sounded terrible.

Cheers

Den

470four:

--- Quote from: Bryanj on March 28, 2011, 07:07:44 AM ---VERY worn and neglected chain and yes the valves should have hit the pistons---have you removed them and spun them in the guides to check?

--- End quote ---

Not my engine, only bought the cam/sprocket so I dont know!  :)

I would have thought it wasnt a pretty sight... aircooled engines are never quiet but FFS - why run it into this state??!  ???

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