(quoted from post at 11:50:08 06/21/14) All this engineerin" talk is beyond me. But I can offer one more tip for the outboard motor guys. If you have the option, try a couple of spark plugs until you find one that has the open part of the gap pointed toward the intake side of the chamber. Having the spark better exposed to the fuel/air might make a difference.
(quoted from post at 07:10:14 06/20/14) Since Guido wanted this limited to small gas engines, the references to autos don't really help. All I know is that a gap that's a little too wide is almost always better than one that's too small!
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