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Re: Spark plug diagnosis - need your input PLEASE!
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Posted by Brian Decatur co. Ia on March 09, 2007 at 16:07:36 from (12.216.134.244):
In Reply to: Spark plug diagnosis - need your input PLEASE! posted by Steven@AZ on March 09, 2007 at 15:53:37:
The H plugs look like a combination of fuel and oil fouling. The JD plugs are just fuel fouled. If these are the hotter plugs, I'm going to guess both tractors don't see much work meaning work that makes the governor open up. Another thing that will affect plug fouling is low coolant temp. If the engine never gets up to 190 degrees, they're only going to foul more. A cold running engine will also have sludge build up since it never gets warm enough to fully evaporate condensation in the crankcase. Work them harder and get the engines hot so they can burn off the carbon deposits.
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