SOHC.co.uk Forums > CB500/550

sluggish 550

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z1100r:
I'm glad its sorted but still a little dubious that thats what was causing it to only rev to 5000rpm and be as sluggish as you say. I would of expected fuel to be leaking out all over the place and the plug on that cylinder to at least have been very black if the problem was that power sapping.

K2-K6:
I think what you're saying is that the needle valve was stuck closed, is that correct? if so then that cylinder would not have been running at all in that case.

If so you could have found it when you started it by putting your hand or a wet rag (before it got too hot) onto each header pipe as that tells you if one isn't firing.

mickwinf:
yes k2-k6 i think it was sticking shut.thats why it felt like it was running on three cyls,exhaust didnt get as hot.Iam sure this was the problem all along,will go for a blast at weekend.

K2-K6:
Hope it goes well anyway as it's nice to get a decent runout on a bike.

The question you made about breathers, they are just the tubes that come ot of the bottom af the carbs and dangle down the back of the engine. They obviously direct fuel away from the motor if the float sticks so neat petrol just goes to the floor but they also keep the pressure equal to normal so that the jetting is not unduly affected as the main jet demand rises during max throttle demand so that the carbs work as designed (obviously not the case here but we were cluthching at straws to help out).

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