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If it were mine, I would run some sea-foam through it. I haven't used it in a bike, but I don't see how it would hurt anything. There are perhaps better treatments available, I don't know for sure, but I've had a lot of success on small engines with it, though - chainsaws, mowers, atv's, I use it for all my small engines, and for customers as well. Come to think of it, I think I'll dump some in my 800 as a preventative. Does anyone out there use or (have used) seafoam in their bike???
Just as you indicate, carbon, compression (too high), cheap gas and engine overheating are all potential reasons.

Recently my 1999 Drifter has begun to'ping' but only 2 up and only when I roll on in top gear on the highway.
Anyone else had this problem or know a cure. I guess lean running and carbon deposits are the obvious cause.
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