First Generation Ascots > The Thumper Years: Stock To Lightly Modified
Fuel problems
wrk2ride_ride2wrk:
try giving the bottom of the carb a sharp couple of taps while its leaking, if it stops, its likely the floats are sticking and the needles not seating
triguyracer:
This is most likley not the problem and a long shot but see if you have a leak in the float itself this can cause the float to stick by having fuel in it and not raising up far enough to put enough pressure on the pin to seal it.check by putting in a small cup of fuel and holding down and submerged if it leaks you will soon be able to tell
scottly:
The diaphragm on the side is the "air cut-off valve"; it affects idle if it doesn't function properly. Check the float needle seat for damage or built up varnish. Also, you can measure the fuel level in the float bowl with the carb on the bike by attaching a clear tube on the spigot on the bottom of the bowl, holding it up next to the bowl, and opening the drain screw. The fuel will rise in the tube to the same level as inside the bowl.
Iainhugh:
It's a brand new needle valve that I fitted. The bike runs absolutely fine. My bro took it for its mot today and it failed on the headlamp not working. Typical because it worked fine last night. >:(
Anyway if the needle valve isn't seating right what are my options. The more I think about it the more I think this is where the trouble lies. Do I buy another one and see if it works any better. Could the problem also be the valve is fine but the little lugs on float might be a fraction out of shape and not pushing the valve completely shut ??
Iain
Scottish highlands
scottly:
Iain, it sounds like the needle valve isn't sealing 100%; When running, the motor is using fuel faster than the leak. Like I said before, check the seat. ;)
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