This one is hard to start just coz of the 2.5:1 fuel... When I did it with 2:1 it would start with 2 or 3 flips, but like av8 said it will run the wrong way.. Then i just flip it the wrong way and it will start to run the right way. lol..... I have just been playing with the engins as of right now.. I hope to get one on a plane and see how it will do in the air.. I think they will do grate. but I have been haveing a grate time doing it...

Paul