Stop the presses! Hold the phone! I've found the culprit! After siting for about 3 months My 300TRX would idle but stalled when reved up. I was going to rebuild the carb so I took everything off down to the carb, twice! Nothing. The second go round I stopped cold! What's that on the end of the carb air intake hose??? Oh, ****, DIRT DOBBERS! Could have cost me BIG $$$$$ at the dealers "Mansion"! Boy am I glad we found the problem. DIRT DOBBERS!