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Old 04-10-2011, 05:40 PM
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bairdco bairdco is offline
a guy who makes cool bikes
Join Date: Aug 2009
Location: living the dream in southern california
Posts: 6,258
Default Re: sparkplug gap size

that's kinda what i was experimenting with.

i know from race car experience that a smaller gap is better at higher RPM's to stop misfiring, as you want a quick spark to keep up. a larger gap takes longer for the spark, and although your car will start easier and idle better, it suffers at speed.

there's another older thread around here about gaps, and i detailed my experiment more.

basically, i startd at .030 and kept going down .005 at a time till it wouldn't start (which was .008)

then i went back to .030 and went up to .050 or something till it would barely run.

overall, it worked fine between .025 and .035, so i just split the difference and went .030
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