when you say “sets shorter in the motor” , you are NOT talking about the thread into the cylinder head, correct? – I suspect that you mean the length of the plug protruding outside the cylinder head. If that is the case, there is no harm, matter of fact it is a benefit in cases where there is a metal cover over the plug and wire terminal.
With the modern line of Champion plugs , I find that on most the insulator is longer than the old style equivalent Champion plugs. This can be a problem in motors with enclosed plugs and wires… like Evinrude Zephier’s. I use NGK BM7A in my Zephyers for that reason, much shorter plug of equal heat range.
Joe B
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This reply was modified 2 years, 7 months ago by joecb.
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This reply was modified 2 years, 7 months ago by joecb.