Quote:
Originally Posted by J-Mech
Ryan is right. If your still getting gas in the crankcase then it may be the fuel pump. HOWEVER, that doesn't explain the gas coming out of the exhaust. I had a fuel pump one time that was starting to disintegrate. Kept plugging the needle valve in the carb and flooding the motor. My 682 just did the same thing. I ordered a carb kit and a fuel pump for mine. I don't like to tear things apart twice. 
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I really don't want to admit it, and kinda have been hiding it, but remember that 682 I had that without much investigation I thought had blown up on me? You know, the one I traded for a set of Ag's and wheel weights? The one that spit gas out its exhaust and such? Well, turns out the guy I got rid of it to replaced the fuel pump and it's still going strong to this day.

So, it is possible that gas is coming out the exhaust due to a bad fuel pump if you crank it enough