SOHC.co.uk Forums > CB350/400
Knocking Noise
cliff7:
I have recently bought a CB400F2 that is off the road at the moment. It is making a knocking noise at idle (carbs have been stripped and cleaned by a professional and fine balanced by me as best I can). Noise becomes less when put in gear and rear brake lightly applied. After reading various posts about this and not being familiar with this engine I would really appreciate if anybody in the Wirral area would have a listen for me. Petrol/beer tokens gladly supplied. I think it might be primary chain but not sure. I don't want to strip the engine yet if it will be ok for a while.
Johnwebley:
Likely just normal clutch rattles.
All of the fours suffer .
Need to sync carbs with gauges.
Also check timing and tappets
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Bryanj:
John you got that the wrong way round, carb sync is at the bottom of the full service list
Johnwebley:
I am an amateur compared to you.
I can't be perfect
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Bryanj:
Why not others are!!
When in trade i refused to do just a carb balance no matter how much the owner insistead the tappets, timing, points gap and cam chain were all "perfectly correct" They rarely were by the way
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