well now that we FINALY finished the motor its a 4mil now .20 over bore....... now were just having backfire and starting problems kicking it over wont start it, the only way to start is to jump start it, and it just gets tireing i had friends watching, to make sure both cylinders were going as well as me riding it... i only thought one was... but yea were just having a problem with back fireing now we assembled it with bellray assembly lube for the wrist pins for a little more easier to put in which is burning off as well but i noticed that when the plugs are out theyre covered in gas,(theyre brand new just bought just had a quick first ride out on street to see how she ran) im thinking jetting? anybody else...... thanks to all..