A few years back when I had access to a Land & Sea dyno I tried several
things
on a Kaw engine. Played with timing , fuel, oil pump output, jetting......
One of the things tried were a few different spark plugs, never could tell
one bit of difference, not even a hint.. Big gaps, indexing, little gaps
"race" plugs, all lead to nothing. I don't even bother to gap the
things any more, take em out of the box eyeball the end and stick
em in.
Given a good enough dyno in a lab somewhere maybe one of those engineer
types could find a difference, wouldn't bet on being able to measure it
with lap times.
Dave Phaneuf
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