Well if you have stock pipes and no other mod's done too your bike other then a lightened fly wheel and the timing advanced then you should not be running a advance timing you should leave it stock, i'm gonna advance my timing + 4 but i have t-5 pipes, no airboxs, filter's, long rod crank, .80 thousand over piston's, high compression head, racing piston's, port and poilshing done, and i have re geared my bike