I have flown the repaired engine twice: no more misbehaving. It turned 10400 with a MA 12X6 on K&B 5%, and 11500 with a MA 11X7 on Ritch's Brew 10%. In other words, nowhere near the 13800 that Fox reported in their test run. Admitedly, I have not leaned it out and could clearly hear it 4-cycle and spitting out some raw fuel. It quit when I leaned it enough to break into 2 cycle and raising the nose.

I did notice that Fox installed the sleeve 1/8" off center. Since they reported such a high rpm, I figured maybe the sleeve was intentionally installed off center. The engine turns over very smoothly, not a great deal of compression, starts easily with a quick blip of the starter, idles around 3000. I am disappointed in the power but the engine does run well.