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Old 04-24-2010, 06:25 PM
Bikeguy Joe Bikeguy Joe is offline
Godfather of Motorized Bicycles
Join Date: Jan 2008
Location: up north now
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Default Re: NGK BP6HS versus B6HS? Differences?

I believe that is for "projected tip" or the electrode reaches in to the combustion chamber a mm or so further.
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