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So my 1994 trx300 does some strange things, it’s will suddenly start to rev up on its own. Could it be the carb?
 

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Throttle cable with too little slack is the most common reason and an intake vacuum leak is the second most common reason.
 

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Carb and choke cleaner aerosols work to find vacuum leaks. Start the bike, use the little straw and lightly spray the areas where you suspect leakage. Gaskets, intake manifolds, boots, ect. The idle will change dramatically if there is a leak.
STAY AWAY FROM THE SPARK PLUG AND WIRING. It is flammable after all!
 
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