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Serious Thumper 2005 No Login
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Professional "scooter trash".
Posts: 5207
Rosemark TN
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All it really takes to make one rough running is a tank of bad fuel.
Happened to me yesterday. Had to hit reserve on the interstate, and hunt for a gas station at the next exit. The one I found apparently has really dirty or really waterlogged gas. Top speed coming home late last night was 63mph. No power, lots of shaking, popping, bucking... I'll just drain the rest of the tank into the driveway (kill a few zillion weeds) and refuel with fresh farm gas. Alcohol free. Add a splash of SeaFoam, Berryman B12 or ATF and ride it until the jets clear themselves out again.
Simple engine, simple carburetor, usually simple fixes.
Stumbling and popping is one of a very few things: Dirty gas. Water logged gas. Gummed/plugged jets. Sticky slide. Pinhole in the slide diaphragm. Bad petcock (mine runs a Raptor already). Holed vacuum line if running the stock petcock.
My money is on, in order: too high a gear for the speed you are riding, dirty jets, petcock.
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