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JD620 FOULagain

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lurch

08-04-2000 14:18:08




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620 is used every day for farm.....Temperature stays at 190 and never misses a beat until plug fouls. I have noticed after 2-3 hours of running in 3rd, it does seem to have a little less power. Will try 388 plugs and recheck carb settings.
THANKS ...LURCH




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clooney

08-05-2000 14:50:01




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 Re: JD620 FOULagain in reply to lurch, 08-04-2000 14:18:08  
Lurch, are you getting black smoke out of the pipe when it's working hard? You might have an air filter inner element plugged up. When I did my 520 there were some dents in the air filter can so I drilled the welds out & pulled the inner element out to repair it, I couldn't believe how plugged it was, I was amazed that it even ran. So I soaked it in gasoline & blew it out, it took many dips in the gas can & a power washer to get it clean. There must have been 2 cu. ft. of dirt in there. "just a thought"

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G Taylor something different with one cylinder

08-05-2000 13:01:19




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 Re: JD620 FOULagain in reply to lurch, 08-04-2000 14:18:08  
There has to be something different with that one cylinder. Oil control by the rings, air/fuel mixture at idle and full power.Combustion chamber temperature perhapes scale in the water jacket, spark energy, plug tip temperature,compression, cam wear/cam timing. Valve guides, you installed new ones didn't you?



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