Best spark plug?
Guys , the other day I bought a set of NGK spark plugs and installed’em on my 150 Ocean Runner, I adjusted the gap at .035 as recommended and went to the lake for a spin. The motor ran at the same top speed but it sounded a bit rough at idle.
With your vast experience with OB’s, what spark plug has performed best for you guys?
Thanks
Joe
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Sea Ray 19.5 I/O 351 Cleveland - SOLD
1989 V20 CC 1998 150 Ocean Runner - SOLD
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