This is a short video of a Moki (Mark) 2.10 break-in . It is turning a Bambula 20x8 prop and burning homebrew 80% methanol and 20% castor. You can hear the engine go into 4 cycle rich setting at the high rpm and come back into 2 cycle when its throttled back. This is the next to last run of the 1st gallon through it. The plane is a Carl Goldberg Yak 54.