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Mercury 40 hp trolling spark plug. (NGK)

H

Howmaster

Member
I have a 2002 Mercury 40 hp / 2 stroke.
(on a pontoon that never gets above 3000 rpm's for the
most part. Just cruising or trolling a lot.)
is anybody with a 40 hp Mercury using NGK BZ7HS-10 plug?
id like to combat carbon without overheating with this plug.
its 200 degrees hotter than the NGK BPZ8H-N-10.
 
Change plugs and check head temps. with infrared gun while running,Check telltale stream for excessive heat flow. Then pull plugs and inspect for ill affects!
 
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