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WR250F stalls when hot won't start

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Hey Guys, my neighbors 05 WR250 will run for a period of time maybe 2 or 3 miles then it stalls and won't start again till cooled off, the only mods are fmf powerbomb header and Q2 silencer with a K&N filter. This just happened to him yesterday twice so haven't had a chance to look it over yet but he hasn't touched the carb, is it lean with the mods, I'm sure it could use a rejet anyway but would this cause the bike to stall when hot? any help would be appreciated, Thanx. :thumbsup:

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i would see if there was some kind of a restriction in the fuel line, mabe it is not cooling down, but filling to carb with fuel again. how does the bike sound when it stops? if it slowly stops untill it dies than it may be a restriction. if it is a rapid shut down where it just dies it is something with the cooling system.

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Hey thanx for the replies it turned out to be the aftermarket gas tank vent, its fairly new but somehow it got plugged and wasn't allowing gas to flow.

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