SOHC.co.uk Forums > CB500/550

Carb problems

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mhirst121:
Well I have spent the best part of two weeks trying all manner of things to sort out my carbs. Eventually thought I had them sussed, but as usual, they were just not playing ball. Can anyone tell me which notch(from the top) the slider needles should be in. The bike is very hard to start and when running there are clouds of black smoke coming from the exhaust. The float heights have been checked at least twenty times, so I am pretty sure they are correct. The jets are all correct(new), the only possible fault I can see is the bottom edge of the carb body is corroded where the main jet fits in showing part of the `o`ring. Would this give the problem of rich running? Honestly, I am getting sick to death of this lot, they have been on and off so often that I can whistle and they jump out and onto the bench!!!!
Any help greatfully accepted, otherwise I think I will need to try another set of carbs  :o

Cheers,
MartinH

Bryanj:
If bike is standard clip should be in middle notch and yes if the "O" ring is leaking the cylinder in question will run very rich

mhirst121:
Thanks Bryan, will check the needles, I think the ones in mine are set higher up. The problem with the `o` rings will be another challenge.

Cheers,
MartinH

Seamus:
Would it be possible to build up the corroded area with some epoxy compound?

Bryanj:
Yes you can "glue" the main jets in as long as you never want them out again and you use petrol proof epoxy---not all are especially with today's unleaded fuels.

One thing to check is the emulsion tube above the main jet as sometimes the cross holes get furred up, this can be a sod to remove as you have to push down from inside the throttle body WITHOUT damaging the needle jet at the top

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