JD 425 Fouling Plugs


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JD 425 Fouling Plugs

guy My 425 recently began fouling plugs after only a few hours. No previous problems. I have changed air filter, cleaned grass from all screens. Reconnected PCV hose which was not in place, changed the oil (which was a little overfilled). Plugs are very sooty and black indicating a rich mixture. After changing plugs, starts and runs fine for a few more hours until it begins to run poorly due to spark plug fouling.

Is it time for a carb to be rebuilt? Does not seem to be a main mixture adjustment only low, high and low idle mixture. Help

Dave I have tghe same problem. Any suggestions
Guy Cline I am not sure what solved my problem but I did the following. Hope it helps you.

Changed the Oil
Connected the PCV hose to air cleaner (it had come off)
Instructed my tractor drivers to be sure thy took the choke off when they mowed the yard.



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