SOHC.co.uk Forums > CB350/400

Hesitant revs below 3,000 RPM when hot.

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Northy:
Oh just had other thought (like you do ).
It could be the O rings on the main jets are  worn or not sealing properly , therefore making it run rich . So if the new air filter doesn't cure it that would be my next port of call.
Does mean the carbs will have come off but its not bad job if know the correct procedure.

However your issue is at low revs so suspect not ....  (make up mind  Northy! ......I talk to myself lot !) :o ;) 

Bradders:
Morning all. Some of you may recall my original post some time ago. Still having problems with rough running below about 3,500 rpm when the engine is hot, in fact it’s getting worse. Have adjusted mixture screws with the help of my mechanic so think they are probably about right. Changed plugs, air filter as well. Wondered if anyone had any more suggestions I could try. The problem is a lot worse when the engine is hot, almost to the point that it feels like the engine is going to stall when pulling away. It’s driving me nuts!

Nurse Julie:
In very, very hot weather like some of the days recently, my 400/4 behaves exactly the same and mine is set up 100% spot on. As soon as the air temp drops, she's perfect again.

Bradders:
Hi Julie. It seems to do it when the weather is cooler as well. Rode it to work at 5-30 in the morning when it was nice and cool but was still the same.

Nurse Julie:
What are your air/ fuel screws set at?.

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