Re: Spark plug diagnosis - need your input PLEASE!

Posted by Hermit on March 09, 2007 at 18:27:17 from (69.21.48.72):

In Reply to: Spark plug diagnosis - need your input PLEASE! posted by Steven@AZ on March 09, 2007 at 15:53:37:

The H has fouling from a rich mixture and one plug has slight oil consumption but not bad enough to cause fouling. The JD has just fouling from a rich mixture. Since they all look the same, I'd look for something common. In wintertime, people tend to forgot to put a winter-weight oil in the air filter oil bath. If you use a heavier oil than recommended for winter, it's like partially closing the choke causing a rich mixture. This constantly rich mixture to the cylinders can cause them to foul out after a while. Good luck.

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