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from start to end: I have a 1999 honda 450 foreman es and the piston and cyclinder had took a dump on me and i order the exact same one "432cm2" off a running used atv after replacing my old with the new and hooking everything back up i still cant get this thing to run, the piston is in correctly with "IN" towards the intake the rings are spaced at 120 degrees, new gaskets, carb. works, new spark plug which has spark and when i remove the spark plug to shoot so fuel in to get the motor to turn over i get a pop noise from the exhaust "backfire". never took the cam or anything from the piston down apart so dont think its the timing but i have been wrong before if you got any ideas they would help thanks
 
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