SOHC.co.uk Forums > CB500/550
Carb float levels
Neill C:
So I've now done a valve and seat swap as well as a light seat and float pin polish and the only way I could prevent it from overflowing was by ever so slightly lowering the float. It hasn't overflowed for over 24hrs now so I'm going to do a clear tube level check to see what the actual levels are. I reckon it'll end up being my inability to set the floats at the right height in the first place thats the problem! Thanks for all your advice.
Nurse Julie:
This may be of help.
http://www.sohc.co.uk/index.php/topic,23233.0.html
deltarider:
Neill, the clear tube method in practice is not as simple as often presented. Therefore I advise anyone to do this method first, to check if anything is wrong at all. Often there's nothing wrong, but there will be after people have 'adjusted' the floats. My test will not lie and is very simple. First check if your carbs are fed fuel the same way as mine, knowing: one tube feeds carb 1+2, the other 3+4. http://forums.sohc4.net/index.php/topic,185754.msg2151647.html#msg2151647 But this method also applies when carbs are fed by one tube. If you understand the principle, you can perform it, be it with a minor variation ofcourse.
Know that all CB500/550s are very sensitive to have the fuellines in exactly the right dimensions and that extra inline filters are a no no.
If you've find one carb that is off and tapping the floatbowl with the stump end of a screwdriver didn't help, then it's time to remove that floatbowl for further inspection. Succes!
Oh, I cannot be of help with any aftermarket parts, as I have no experience with them.
Neill C:
I readjusted the float levels and did a bench test
No overflow for a couple of days. I refitted carbs and still no overflow. Then I went out for a 20 mile ride. One carb overflowing like you wouldn't believe. I head home, park her up, turn the fuel on and no overflowing. I want to cry!😭😭
McCabe-Thiele (Ted):
I feel your pain - was it the same needle & seat that you moved?
If it was me I would be fitting a new float plus the needle & seat assuming the originals or a decent new aftermarket replacements are available.
Just a long shot but is it fresh fuel i the tank?
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