Pulling the wire off a bit, dramatically raises the resistance between the coil output and ground. As a coil discharges, voltage increases when resistance increases,,,,, you are making the coil put out much higher voltage. And this higher voltage is enough to properly make the plug fire. SO>>>>> this usually means the spark plug is either fouled up, partially open/ separated inside the ceramic, or has some other defect. Either way, it means the plug is not firing normally, sometimes even due to high compression, as high compression requires a better plug, to fire correctly. Usually... a new plug will fix this. Usually... If plug is fouling out due to oil or other, a new plug will quickly foul again as well. I have also seen this happen where a head gasket was leaking moisture into the cyl, and the increase spark would make the plug fire correctly or enough to fire off the cyl... again making a "fouled plug" fire. Either way, your raising the voltage to fix a problem or various problems.
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Today's Featured Article - Identifying Your Tractor - by Staff. Maybe you bought it from a friend who didn't know what kind of tractor it was, or perhaps (and this is every tractor fanatics dream) you stumbled across it in an abandoned field covered with weeds but intact. In any case, you have no idea what the make and/or model is. For awhile perhaps it doesn't really matter. Especially if it runs! But pretty soon you'll probably need to tinker with it a bit and maybe buy a part or too. Having a manual is nice. But how does one go about dete
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