I'll bet that it will run cleaner and leaner.

You will have to richen up the mixture, and dead sticks would be a thing of the past.

Idleing would be rock solid and the timing would be advanced.

I'd like to see the test results. A true before and after test.

Prop sizes, rpm, head tempature and fuel mixtures.

I had a motorcylce, a 250 desert CZ, that gained a lot from a second sparkplug.

Low end and midrange especially.

I have been wondering how those old motors would of ran on a 1/3- 2/3 mix.