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i have a used revo 2.5 it runs at idel or a little above idel but spits a mist of fuel out of the carb when engine is runnining and only runs for 2-4 minutes i can pull the muffler pipe off and it has a build up of fuel in it enought to drain some out. i even tried to cut the fuel flow adjustment way down like just enough to run engine and got the low air speed set at best to run a little pass idel. is it the carb or engine the problem.??

first off you shouldnt run your motor with out the filter or it will be shot and at idel you will get a little access fuel in your pipe id put the needels to factory settings and then see how it runs you might have your idel a little high also

Are you burning a whole tank of fuel in 2-4min? If its idling and quits after 2-4min, its loading up cause its prob rich. Set needles back to factory and tune it from there. HSN 1st, then LSN, and then set the idle.