please help

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henry03250

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Joined
Nov 30, 2007
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Location
Arkansas
Ok i bought this about 2 months ago and i cannot get it to act rite. Iv never heard it run. I got it bored .50 over, new piston and rings, cdi box, brand new carb,cam and flywheel line up perfect at tdc. good valves, textbook valve clearance,new one way starter clutch and gear. I did check the ignition coil-works perfect. plenty of spark at plug. But when i try to start it, it cranks fine untill it fires and then when it fires it tries to kick the motor backwards and backfires through the carb.

please help!!!
 
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