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klx 650

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Hi guys i have a klx 650 94...fmf mega max pipe air box lid removed .Purchsed the bike just recently.Have had problems with the bike.Idle increases to around 3000 then slowly drops.Will stall at the lights often and require choke to restart.Sometimes i will start slowing down and bike will cut out completely.Air mix screw is about 2.5 turns out.Is it running to rich??there is no real problems with backfire..I am taking it to the garage in the morning to have the carbie cleaned and the jetting looked at..anyone have any suggestions on what the jetting should be...many thanks

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