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Garden Tractors Discussion Forum

JD Kohler 12.5 hp Knock

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Pat

05-15-2004 21:00:01




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5 year old John Deere mower. Getting an engine knock, tore the motor down and don't see any slack. Can't figure it out, got any ideas?




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Bob

05-15-2004 21:37:16




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 Re: JD Kohler 12.5 hp Knock in reply to Pat, 05-15-2004 21:00:01  
I had one of those in the shop several years ago. We tore the lower end apart, and found nothing amiss. At some point, we removed the head, and found one of the throttle butterfly screws had fallen out, been sucked into the cylinder, and was imbedded into the piston top, banging an the cylinder head. we chiseled it out, and reassembled the engine, and replaced the carb screw. End of problem. Not too likely this is your problem, but worth checking out.

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sibby(Aus)

05-16-2004 05:27:34




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 Re: Re: JD Kohler 12.5 hp Knock in reply to Bob, 05-15-2004 21:37:16  
Bob, the carby screw on top of piston is a very common problem down under on the Kohler engines in the J.D. ride ons .



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David

05-16-2004 08:28:21




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 Re: Re: Re: JD Kohler 12.5 hp Knock in reply to sibby(Aus), 05-16-2004 05:27:34  
Carbon build up on top of piston will do the same thing,



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