Ah..sounds like you fouled a plug. I run NGK's with a hotter heat range. Runs fine. Does it Misfire....or does it just sound like a dead cylinder? May not be the carb...My 600 ran fine on my stock 292....until the engine finally died on me. lol Serious valve train issues going on when the engine gets hot...weird...but...good excuse to jerk the old out and in with the new.
