SOHC.co.uk Forums > CB750
Engine Knock when warm
MalD:
Ive recently bought a 1975 CB750F1 as a bit of a project bike. Its a runner so i put it through an MOT so i could run it a bit to see what needs doing. Starts no problem and generally runs fine. However as soon as its warm i get a low knocking sound!!! It does seem to smoothe out if i rev it but as soon as it idles its back. Leave the bike to cool and its fine again. First thoughts were carb balance which has been done, with no effect. Any other advice before the inevitable winter strip down :(
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hairygit:
Does it quieten down if you pull the clutch in?
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MalD:
--- Quote from: hairygit on October 10, 2017, 10:46:31 PM ---Does it quieten down if you pull the clutch in?
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--- End quote ---
Hi, No I get the usual clutch rattle which quietens down when I pull the clutch in. The knock persists unfortunately, but only when she’s warm!!!
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MrDavo:
Could be the bottom end, any sign of the oil light when she's running?
MalD:
--- Quote from: MrDavo on October 11, 2017, 09:47:12 AM ---Could be the bottom end, any sign of the oil light when she's running?
--- End quote ---
Funnily enough it did flicker yesterday on idle. But went straight out again. First time it’s done that
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