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Discussion Starter #1
i have a 79 yamaha exciter 440 that was runnning great until the fuel/air screw worked it way in and it quit runnung, so i adjusted the screw out and got it running decent again but it misses real bad at high rpm's and wont go wide open. we checked the reeds, cleaned the carb and still nothing, we eliminated the oil injection and now premix it, would that have anything to do with it? but it ran good for about 3 hrs until it stalled when the fuel air screw turned in itself. right now we are completely puzzled and hope someone has an idea of what might be wrong.
 
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