How often is it ridden? Sounds like your carburator needs a good cleaning. They plug up quick if you don't ride very much. Even if you ride alot, I'd start there. Next check your intake boots for cracks or leaks. If you put on any air filters or exhausts I assume you had it re-jetted to compensate. I'd check your valve clearance while your at it. Should be one of those. Hope that helps. DM
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