zack98banshee Posted September 13, 2014 Report Share Posted September 13, 2014 I have a 98 banshee that I just recently bought, I bought it not running and put a new top end on it with stock bore and wisco pistons. I rebuilt both carbs, cleaned the fuel system and put new plugs and even coil. It has 150 psi compression on both cylinders it will idle all day long and starts up on first or second kick. As soon as you start riding and getting into high rpm's the left cylinder backfires and stops firing (only running on right cyl) both carbs are perfectly clean and synchronized. Reeds look good on both sides as well. What could it be? Quote Link to comment Share on other sites More sharing options...
oldskool Posted September 13, 2014 Report Share Posted September 13, 2014 Did you perform a leakdown test after rebuild? This is a must do test. Quote Link to comment Share on other sites More sharing options...
JKJK Posted September 13, 2014 Report Share Posted September 13, 2014 Is the crossover hose in place between the carbs?If so i would start by switching the coil wires to the jugs+see if the problem follows+go from there. Quote Link to comment Share on other sites More sharing options...
sleeper06 Posted September 14, 2014 Report Share Posted September 14, 2014 Leak down before meltdown Quote Link to comment Share on other sites More sharing options...
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