Posted by buickanddeere on November 24, 2007 at 18:18:10 from (216.183.138.208):
In Reply to: Cleaning spark plugs posted by Tom Stein on November 24, 2007 at 16:31:48:
A plug can not be cleaned any more than a burned set of points can be filed. Either case is just a emergency fix to get back to the shop. When the glaze coating or the silver layer is gone. So is the plug or points. Odds are if the engine isn't worn out. The plugs are fouling from putting around at low rpms and light loads. The rad shutters or thermostat in older equipment tend to get tossed behind the shed in the junk pile. A cold running engine requires a richer mixture to start and idle. This just compounds the fouling problem adding the over rich mixture to a cold engine. Try getting the coolant up to 195F or higher. Then getting the idle and high speed mixture as lean as possible. As previously stated non resistor plugs such as the Autolite 216,437,3116 or 478. AC Delco C88L ( I think?) or Denso 3020's are great non resistor plugs. Chucking the resistor wires for solid core wires isn't going to harm anything either. Unless you are running a 10M ham rig from your tractor.
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