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In Reply to: SEARS 16.5 KOHLER,Backfire on start posted by JOHN on Monday, March 17, 2003:
John you say when the tractor does run it runs fine. That would lead me to believe your valvetrain is fine. If there were problems in the valvatrain the motor would be making a knocking sound. Sounds to me like an ign. problem. The timing sounds like it maybe out of whack. I would check to see if it is adj. or not. Good luck!