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Are you currently running the stock 15 tooth countershaft sprocket with a 44 rear or have you stepped up to a 16 tooth front? Full exhaust system including header or a slip-on silencer? Base line jetting should start with a 125 or 127.5 main jet (buy both jets just in case), a 35 pilot jet (Mikuni smooth side) and the needle on the 4th clip position. This should do until you decide to change to a K&N pod style airfilter, also please include a picture of your exhaust problem with what bolts are not lining up.
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Bikes: Yamaha 1974 Yz125a, Yamaha 1974 Sc500, Yamaha 1977 Rd400, Yamaha 1978 Yz125, 1988 Harley Davidson Xlh 883, 2006 Ktm 450 smr, Ekeleton 2006 Beast 200cc the worst bike I have ever owned
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