Check your plugs right after a run, I'll bet they are rich and becoming fuel fouled. If they are then you either need to run it leaner on the juice (which is fun since it means more HP) or you may want to try a hotter plug. Both of these can lead to detonation so it should be done carefully: make the change and then do a short 3rd or 4th gear pull and then yank the plugs and look for excessive lean condition or detonation. Good luck..
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