dolt
Well-Known Member
Regardless of what brand plug one chooses, one should run the coolest heat range one can run. What one builder might say, another will say different. There is much more to plug reading than pulling the plug and looking at the color of the insulator. First, plug cuts are required for accurate plug reading at cruise and WOT. You get on the bike, get motor to operating temperature and head out with a handful of new plugs and new plugs in the motor. If checking at WOT or cruise, kill the motor under the condition for which you are checking, pull the plug and read the ground strap for heat range and the base ring for jetting.
The ground strap indicates the heat-range of the spark plug. If the "color" of the ground strap "changes" too close to the ground strap's end, (which is above the center electrode), then the heat-range is "too cold" , meaning that the strap is loosing heat too quickly to the base ring, and is not able to burn off deposits until near its end. If the "color" of the strap changes near where it is welded/attached to the base ring (last thread ring), then it means that the plug heat-range is "too hot", because heat is not being transferred/cooled from the strap to the base ring quickly enough. The strap might begin to act like a "glow-plug", eventually causing pre-ignition and/or detonation later on. Proper heat-range is when the "color" is at the half-way point on the strap, neither too cold or too hot.
Check the plug you are running for heat range; you might be surprised.:shock
