SOHC.co.uk Forums > CB350/400

running problem

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Spitfire:
Have you checked the points, ignition timing, advance and retard unit, plugs etc before focusing on the carbs ?

Cheers

Den

Bitsa (Ralph Wright - RIP):
Steve,
If I remember right when I restored a 400/4 mine acted like that and it turned out to be the o rings on the jets.
Might be the same for you.
Bitsa

steven400/4:
waiting for a mate to come and check all that before i take the carbs off but still waiting for him  :'( :'(

exvalvesetdabbler:
Fuel starvation or gross over fuelling. Does it smoke or whiff of petrol from the exhaust
At that rpm/throttle position the pilot jet would have little influence since it runs ok ? at smaller throttle openings.

Check the simple things first

filter gauze on fuel tap blocked
Tank breather blocked
choke flaps not fully open can also cause problems
float needles sticking/clogged up not just the valves but the float movement on its pivot pin
induction air leak around some rubber bit

Next thing would be float heights, main jet needle circlip position and main jet size 

steven400/4:
thanks for that looks like the carbs are comming off then >:( >:(

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