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1992 yamaha wr500 wont start without pouring gas in?

it will only start if i pour gas in the carb and as soon as that gas is gone it shuts off. I have ckecked the spark plugs, installed new gas, new inline fuel filter good pressuse in lines when i remove them, gas line in good shape.it ran perfect last time i had it out, about 2 years ago, a friend told me there may be a filter in the carb, but i dont know i dont just want to tear the carb off with out just cause.
thanks for any help.
ron, August 2008
U leave fuel in a carb for any length of time and all the good explosive stuff evaporates leaving behind a gross snot like jelly that clogs up jets and drillings.Removing carb and striping of float bowl and cleaning out everything,especially the float valve will usually do it Carb cleaner sprayed into all jets and holes before reassembly.and check all diaphrams and gaskets.

caine, August 2008
link Click here to see other fixes for Yamaha.