Anyone ever had this problem before??? it starts at 2:36 and clears up when i come off track... it wouldn't run hardly at all and if i went WOT it bogged out. held half way it would run but sounded like REALLY bad spark knocking... and finally it cleared out and revved all the way through? got me stumped. i checked for air leaks, jetting, dirt in carb, junk on the petcock filters, found nothing. checked plug and wire.. all looked good..
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