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Spark Plugs
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Posted by PA Steve on December 01, 2004 at 12:52:44 from (204.60.75.237):
I've been working on an H for the neighbor. I replaced the plugs with autolites, but then the engine started missing severely. In fact, it was only running on two cylinders and sounded just like a JD B.
Anyway, when I pulled the wire off the plug and held it a half inch away from the plug, it fired fine. When I put the wire the whole way on, it started missing again. Then I replaced the plug with an old champion D18Y and it fired with no problem. All plug gaps are correct and point gap is also correct. What causes this? What is the ideal plug for a light/medium duty H?
Thanks,
Steve
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Engine Basics: Spark Plug Cleaning - by Staff. Cleaning procedures: Brush or blow dirt from around the spark plug base. Remove the plug with a correctly fitted wrench. Examine the porcelain insulator and points. If the insulator appears to be melted or blistered, cracked or broken, and the points seem unduly burned it is evident that the plug is operating too hot and it should be replaced with a colder plug. If the plug is fouled excessively with carbon it apparently is operating too cold and it should be replac
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