SOHC.co.uk Forums > CB750

NGK plugs

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Pauarc:
Turned no 1 out a little more now all same colour but the tic over uneven if set at 1000  not sure 🤔 what maybe the problem runs well otherwise

Martin6:
TBH, i wouldn't worry about it at all at only 1,000rpm. Set it to 1200rpm and I'd expect it will run evenly. Mine's similar, but very smooth at 1200rpm. I expect so much has to be spot on to idle evenly at 950rpm, hugely unlikely to get it like that, 50 years on, without major work, new carbs pistons, chains, remove all wear in the valve train... etc. Better to tune it to be a good mix for running.

Pauarc:
Could this top seal be giving a vacuum leak as it’s damaged

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