I have a 1999 500 liquid cooled Grand Touring. I am having fouling problems with one of the two spark plugs. I checked the compression on each cylinder and both seem to be the same. It also seems that I am using more gas these days. Anyone have any ideas of what might be causing this?
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Could be running too rich? What color are the plugs when you take them out? Blacker and you'd probly be running rich and need to jet smaller. I think anyways...
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