Difference in NGK B and BP plugs



Master Bike Builder & Forum Sponsor
Dec 28, 2007
Duvall, WA PNW
SBP was able to get a bulk buy on NGK BP6HS spark plugs. This plug is an extended tip, high perf version of the NGK B6HS. All other characteristics are the same as NGK B6HS. We've been thinking about this plug awhile but we were concerned about the extended tip. We don't normally do this be we can't guarantee this plug will work on all 49cc engines, so you may need to do a fit check to assure no piston contact. On the 67cc engines fit should not be an issue.

The extended tip should raise the CR a tiny bit, and it also should help prevent fouling. With the spark more centrally located, combustion should be more complete.


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