SOHC.co.uk Forums > CB500/550

Running on three

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gary123:
Well the easy start brought the cylinder in, any advice on what to do now will be gratefully accepted.

JezzaPeach:
Hi just a couple of easy checks, maybe swap the plug with#4 and also drain the float bowl and measure, mine are all about 50ml. I used a cheap plastic water dispenser cup marked at 50ml, the petrol melts everything else plastic!
Ash’s excellent tip correctly says to drain tubes first for absolute accuracy, but a straight drain still gives an approx measure.

K2-K6:
Seems to confirm no fuel flow through that idle jet, which ultimately means clearing it. These can unfortunately (similar for any small flow jets on most carbs) require a few times cleaning when getting them going again. Frustrating, but often typical as any small amount of debris from anywhere in the system can get stuck in such small openings.

You could try firstly winding the air adjustment screw fully inwards while running it (gently) until it has no air supply (essentially the same as putting your hand on the carb, but just for the idle circuit) to see if anything soft that's restriction in there will get going again.

Otherwise it's pulling at least that jet and also blowing through the associated air passage to bring it back to fully operational.

K2-K6:
To be clear, closing the airscrew is just a measure to encourage the vacuum to draw any obstruction from the fuel jet on that idle circuit, if it supports running then it can be set back to desirable adjustment and monitor for running then afterwards.

gary123:

--- Quote from: JezzaPeach on November 05, 2022, 12:59:45 PM ---Hi just a couple of easy checks, maybe swap the plug with#4 and also drain the float bowl and measure, mine are all about 50ml. I used a cheap plastic water dispenser cup marked at 50ml, the petrol melts everything else plastic!
Ash’s excellent tip correctly says to drain tubes first for absolute accuracy, but a straight drain still gives an approx measure.

--- End quote ---
Ive tried swapping plugs and leads, made no difference, Ill drain and measure.

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