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  • 2 weeks later...

This pic will give you a good idea of what you are looking for. You can see where the black is. It is where it has burnt the strap and an ideal plug will have that burn to 3 and 9 o clock on the plug. As you can see, this one is more like 4 and 11 but you get the idea. No need to cut the plug. Unless you are almost too lean, you won't show heat after just one pass. I generally use 3 full throttle runs and then check the plug. If you build heat to 3 and 9 after about 3 runs you are spot on. If you want to hot lap the motor you should prolly richen it up a little from there.



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