The normal plugs for a 2nd gen 13B are BUR7EQ leading and BUR9EQ trailing.
I bought a set of hotter plugs BUR6EQ leading and BUR8EQ trailing from
Mazdatrix.
I think my climb RPM and max. cruise RPM are down about 50.
Any logic on why a hotter plug would cause this, or maybe it's something
else, or is it my imagination?

Perry

Kind of amazing Perry. As I recall hotter plugs lead to shorter
plug life and perhaps detonation.

Can you go back and repeat the test?
Can you get colder plugs?


BTW if you want to fly down for Seven Stock I can pick you
up at Camarillo if you would rather land there.

Paul Lamar ...No rotor no motor.

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