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I installed a molossi 70cc bbk ,del otro21mm carb 90 main jet stock exhaust electric water pump stock oil pump. When I try to kick it over with the kick start it kicks back hard not all the time it's will start and run its like I can barely push it down slow and it will kick my foot back it didn't do this stock I heard it could be the timing how do you adjust that when the flywheel can only go on one way right  it kicks back so hard that it chewed three splines off the gear waiting for replacement can someone steer me in a direction on how to fix this issue