Posted by Bill(Wis) on January 08, 2021 at 22:12:15 from (148.75.118.81):
In Reply to: Spark plugs again posted by svcummins on January 07, 2021 at 18:33:59:
Spark plugs have heat ranges. Maybe you're using a spark plug that, for your application, is too cold?? Causing the engine to run hotter might also fix the problem. A too rich mixture will introduce more cold fuel/air mix thereby causing spark plug temperature to be too low. These are all guesses but I do know that on our old WC Allis Chalmers the spark plugs would foul when doing light work such as pulling a wagon but doing heavy work, such as pulling a plow, that would never happen. Dealer, who was a first-rate mechanic said to run engine hotter by putting cardboard in front of radiator. Even on hot summer days. That was hard to swallow. But, it seemed to help. Tractor did not have a temp gauge.
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