August 21, 201610 yr Out on the bike today and I notice the bikes was losing a good amount off petrol from the over flow on the carb !so went back the the van and took the carb apart and cleaned the jets etc and put all back together and worked fine . Then after about 45 mins same thing happened again ! Back to the van etc striped carb apart cleaned it put all back together n still the same problem . Tried that coulple more times and it kept losing petrol even when the bike wasn't started . What could the problem be ? (2013 sherco290 )
August 21, 201610 yr Can't help with the problem, but congratulations on being one of only 6 people left in the world who know how to spell losing.
August 22, 201610 yr I assume it has a Keihin carb, look on splatshop's site in the blog section & you'll find a step by step guide on getting the float height set right http://www.splatshop.co.uk/blog/2012/12/setting-the-float-height-on-the-keihin-pwk-28/
August 23, 201610 yr Check the needle valve pin is clean and moves up and down freely in the seat chamber. Clean the chamber using a cotton bud attached to a slow speed drill with a little autosol polish. Check the point on the needle valve hasn't got any marks around it ( scores) Do u have a fuel filter fitted between the tank and the pump? If there is ***** in the tank then this will get to the carb via the fuel line and will not allow the needle valve to ' shut' causing overflow. Edited August 23, 201610 yr by lockie28
August 24, 201610 yr Can't help with the problem, but congratulations on being one of only 6 people left in the world who know how to spell losing. Too scared to post anything now did not know our spelling would be checked? Back to the petrol leak! Is the carb syphoning out of the overflow pipes aka Beta? The easy fix in this was to cut a hole half way down each of the overflows!
August 30, 201610 yr Hang on. Before you do any of the above. I am assuming that your Sherco is a yellow framed, "tank under the seat" model? If so, then your problem may be the pump bypass loop, which is located under the rear mudguard. It is a black rubber pipe, which runs from the fuel pump, up the inner mudguard and loops up near the fuel tank filler cap before returning back down. At this high point there are one or two fuel vents/breathers, which have a small screw to loosen, which vents air from the system. It may be that the screw or screws have vibrated loose, allowing fuel to escape, run down the vent pipe to the carb and appears to be the carb overflowing. This happened to mine. Just remove the rear mudguard to see if this is the problem. Check the hoses and their clips as well. And fit one of these, to keep dirt out of your fuel tank: http://www.ebay.co.uk/itm/sherco-fuel-cap-cover-/272330761828?hash=item3f682da664:g:~q8AAOSwyQtV3EuR Edited August 31, 201610 yr by stpauls
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