SOHC.co.uk Forums > CB350/400

Hesitant revs below 3,000 RPM when hot.

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Bradders:
Thanks Northy. I checked my plugs last night and when compared to the photos in the manual looked like might be running rich. So for the price of a new filter I think it will be worth trying.

Chris whit:
Hi , did you manage to sort your problem , i have exactly the same problem , mine is bogging down when trying to set of when warm . The carbs were reconditioned a couple of months ago and all was fine . Started doing this a couple of months after . Stripped and cleaned carbs and slow running jets  again . Seams to be running rich i think . Would using a smaller slow running jet sort the problem or is there anything else that you guys would suggest . Bike runs fine and pulls great with no smoke , done a colour tune and carb balance.

Nurse Julie:
Don't change jet size, just keep standard ones and play with air / mixture screws. What are the screws set at at present?

Chris whit:
Julie , they are set to 1, 3/4 turns , i have noticed that I don’t have to use much choke to start the bike from cold . I originally bought this set of reconditioned carbs from Gerben . Might try changing plugs and air filter.

K2-K6:
As above,  they would be unusual to need jets away from spec if all is standard.

But running rich is clear to see and feel with no choke starting if ambient temperatures are down.

What length of time has the air filter been in the bike and is it in any way impaired? It's not unknown to get a pattern filter that hasn't got decent flow capacity so inspect carefully to make sure it's OK.

Try taking it out to see if it runs more normally mixture wise just for a test.

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