Re: M fouling plugs

Posted by Bob M on October 12, 2006 at 07:46:13 from (151.190.254.108):

In Reply to: M fouling plugs posted by chadd on October 12, 2006 at 07:27:20:

Probably a couple things going on:

1 - Carb is set too rich. Try turning the carb high speed mixture screw 1/4 turn at a time until the gray in the exhaust pretty much disappears when you snap the throttle open. But don't turn the screw in so far the engine stumbles when you open the throttle. Also check to make sure there's no restriction in the air cleaner or air inlet tube before making any adjustments!

2 - Spark plug heat range is too cold. Recommend Champion D-21, Autolite 386 or equivalent for a good, "hotter" plug.

Not likely it's a problem with the distributor point gap. Set 'em about 0.020 and the ignition should work fine.

Also a brief blue whisp in the exhaust at startup is pretty much normal for the letter series tractors. Not likely you have an oil-fouling plug problem.

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