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JD620

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lurch

08-03-2000 17:34:39




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Have 620 that fouls spark plugs "BLACK". Have 90 over pistons, new rings, valves, seats, cam, intake, rebuilt carb. Runs GREAT for approx. 3-4 hours under load and then fouls out # 1 first. I can pull plug wire 1/4 inch off plug and run 3 more hours until plug dies.




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Chuck

08-03-2000 19:42:57




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 Re: JD620 in reply to lurch, 08-03-2000 17:34:39  
Lurch, have just completed installing Genessee electronic igniton on a 50/520/620 and I believe if you invested in one it would solve your problem, the ignition is twice as hot as the old point set up and it will light up those plugs on this unleaded gas....you're having an ignition problem....all 3 tractors run twice as good....there was an article in the recent Green magazine and it does everything and more as advertised.....

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u-2

08-04-2000 02:39:42




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 Re: Re: JD620 in reply to Chuck, 08-03-2000 19:42:57  
what does that electronic ignition do for you that a good working original ignition system won't? as long as there is enough KV to jump the plug gap at the compression you are running the extra KV produced by an electronic ignition won't do you any good.



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lurch

08-03-2000 18:14:34




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 Re: JD620 in reply to lurch, 08-03-2000 17:34:39  
YEP....Stranded plug wires, D16 Champion plugs, everything new ignition wise, have over 100 hours on complete rebuild. It was fouling plugs prior to rebuild. It runs GREAT and pulls hard for 2-4 hours and then fouls out "BLACK". I still think it's carb related, but have not found a new one.
THANKS



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clooney

08-03-2000 18:03:09




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 Re: JD620 in reply to lurch, 08-03-2000 17:34:39  
Lurch, I assume you have checked the obvious like air cleaner restriction, old gasoline, etc. There are a few things to check that will make a 2-cyl foul plugs, does it have a thermostat & does it work? does it have solid core ignition wires (not auto TVRS carbon core), is the ignition timing correct, is the slow idle set high enough, does it have enough hours on it for the rings to be broken in, is the carb. adjusted too rich, does it have a nice "blue" spark, are you using a lead additive ( if so use less ). Have you put in new spark plugs (cleaned plugs re-foul real easy), are you using gasoline with alcohol in it ( that gas likes high compression engines). If all above is OK try changing spark plug brands, if it still fouls plugs go up a heat range or put 2 gaskets under plug (that makes plugs run hotter), try adjusting carb. to run as lean as possible.

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