40FP and Moosecan Muffler
the moosecan that I was using was 6 1/2"length by 1 1/2" diameter. I tried using a can that was 6 1/2" length by 1 3/4" and I would have to lean it out completely to get it to run. So I swapped to the 6 1/2" by 1 1/2 diamter, to get 12,000 RPM/