ORIGINAL: kram
I'm also getting 6,400 on 22X10 Zingers after 1-1/2 gallons of 32:1 Lawnboy. 950 ft elevation.
I'm a little disappointed.
Both engines are running clean, and I hate to push the limits on lean since they're on a P-38 and engine-out can be a real disasster.
mt
Something isn't right. I'm on my 6th gallon now and mine is turning the Mejzlik 22 x 10 at 7500 rpm. Temp was 75 degrees @ 450 ft elevation, 50:1 Stihl oil.