SOHC.co.uk Forums > CB350/400

Carbs got to come off again

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Ken4004:
The old bikes are a present that keeps giving so sorted the issue out with the bike not pulling properly and over heating which now seems to be fixed so please with that but now the bike is harder to start and won’t idle so looks like there is an issue with the pilot jets being partially blocked so got to take the carbs off again and give them a good clean.
I thought if I am going to all this trouble I’ll buy some more quality fuel hose and replace the whole lot, empty the tank and give it a slosh round with fresh fuel (e5) .

Just in case ( I know alot of people don’t like them but I am going to replace the sintered fuel filter with a paper one.

So just as a question what’s the average amount of times you have to remove your carbs over a calendar year ?

Johnwebley:
Normally zero

Just an idea

Put some carb/injector cleaner in the fuel every so often

Help keep the carb internals clean

Redex or similar



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exvalvesetdabbler:
About 10 year ago for me, when I got tired of a sticky float and puddles on the floor after it had been stood for a week or more. Float valve was ok, the frame on the float had been bent and was getting stuck once it rested on the bottom.  Substituted another float and no problems since.

I do drain and flush  the carbs out before a winter lay up. Just feed it from a remote reservoir  of white spirit down the fuel pipe.

Regards
Dave

Ken4004:

--- Quote from: exvalvesetdabbler on June 17, 2026, 06:21:03 PM ---About 10 year ago for me, when I got tired of a sticky float and puddles on the floor after it had been stood for a week or more. Float valve was ok, the frame on the float had been bent and was getting stuck once it rested on the bottom.  Substituted another float and no problems since.

I do drain and flush  the carbs out before a winter lay up. Just feed it from a remote reservoir  of white spirit down the fuel pipe.

Regards
Dave

--- End quote ---

Hi Dave

Do you leave the white spirit in the carbs or are you Just driving out all the fuel with the white spirit then drain it out ?

exvalvesetdabbler:
Leave it in.  I do put about 3 spots of engine oil per 300 ml.. just drain it out in spring, connect up to the fuel tap, turn it on and it's fires up 3rd kick.

Regards
Dave

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