SOHC.co.uk Forums > CB350/400

Cylinder one running cooler than other three

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billywingnut:
Having restored my bike and done around 300 miles I notice cyl. one runs cooler from cold start, when hot it's difficult to tell. The carbs all had new DS kits fitted and I balanced carbs twice. The valves were lapped and new rings fitted, new plugs and plug tops. bike now has 34000 on it. No smoke and it pulls well. I have done valves to 3 thou for the hot summer. I thought I knew the answers to most things but not so sure now.  Before I start ripping things apart again I would appreciate your views.

petermigreen:
As cylinders 1&4 share coils/points probably safe to eliminate those.
New plugs aren’t guaranteed good though. I’d try swapping plug with another cylinder first to eliminate or prove plug In number one is all good. Also double check lead/cap.
Peter


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Nurse Julie:
Could it be a case of No 1 cylinder is running at the correct temperature and 2,3 and 4 are running very hot?

Rob62:
Compression test?

Tomb:
what he^ said

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