Thread: B8HS-10 plug
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Old 06-13-2014, 08:39 PM
FFV8 FFV8 is offline
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Join Date: Oct 2013
Location: Spring Valley NV
Posts: 545
Default Re: B8HS-10 plug

The -10 suffix on NGK numbers is the gap in millimeters. That plug is pre-gapped @ 1.0mm or .040 inches.

The rule of thumb on air cooled 2 strokes is to run the coldest plug that you can. The plug is only too cold if it fouls easily. if you can run an 8 or 9 heat range in NGK without fouling then use that. If the 8 fouls after a couple of tanks of fuel, step up to a 7.

A cold plug does not cost you power, but a plug that is too hot can cost you an engine.

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