Honda-SOHC
SOHC.co.uk Forums => CB350/400 => Topic started by: martyn1061 on December 15, 2021, 10:42:47 AM
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Hi
Just overhauled carbs, started up and motorcycle running very rich. Any ideas how to adjust mixture strength.
Thanks
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Check float levels, make sure choke is fully off when lever moved (it may need adjusting) and set airscrews about 1 and a half to 2 turns out from fully in.
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Hi Gareth
Thanks for that, i have done that, I have even adjusted the air screws out 2.5 turns to weaken it further but still running rich.
Unless I re-strip the carbs and recheck float heights.
Martyn
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I'm a novice here - my first question is are the compressions good - does it fire up from cold easily? Do you have standard a air filter arrangement. If the answer is yes to all I would re-check float levels & needle positions - are the carb floats, needles original or good quality replacements?
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If running a standard carb setup, check under the seat. Is the air intake blocked / restricted?
Dave
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I'm running single filters, compression good, all new jets etc. I have removed the carbs again now so i will re check float levels.
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Put the original jets back in, aftermarket are notoriously innacurate
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Presumably a 400 four ?
You'll probably need to tell us what jets are in there to get more considered view and input.
Individual filters can be difficult (but not impossible) to get a consistent setup, but with some baseline settings that look odd to the std factory baseline.
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Hi
As i have got the carbs back out i will put the original jets back in and recheck float heights