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Message: [QUOTE="sarsipious, post: 1130897, member: 74142"] Hey, My first post on this board. Lots of good info available. Just hoping you knowledgeable types might be able to help me get this thing sorted. 1987 model TT600. Starts easily (now) and idles ok once it is warmed up. However it backfires under any throttle - mostly when backed off. Right from idle and onwards when ridden. from what I have read on this forum it could be one of the following, air leak in either the carb, carb mounting, or headers/pipe joins. Or slide upside down. I will try to work through these items but I believe the bike has (just bought it) had a wiseco piston put in it. Seeing as this may have raised the compression from 8.5:1 to a possible 11.5:1 could these symptoms (backfiring) be caused by the standard plug now being too hot/cool ? Any idea's would be appreciated. Like I said I have done searches on the forum and will try the above air leak checks. [/QUOTE]