[bI WOULD CHECK THE FOLLOWING:CHECK FOR GOOD COMPRESSION, PREMIX RATIO CORRECT, CORRECT PLUG BEING USED?, AIR/FUEL MIXTURE SCREW SETTING, CLEAN AIR FILTER
I TRIED SEVERAL PLUGS UNTIL MY BIKE RAN GOOD. THE STOCK PLUG IS IRIDIUM STYLE (EXPLENSIVE, BUT MAY BE YOUR BEST BET). GOOD LUCK.
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