http://www.youtube.com/watch?v=s_jioG_a7LMNot that my tune is perfect, because I have not touched the needles on this engine for several runs, but it should be so rich that is is blubbery when you first start it and then as it warms up, it can handle the fuel load. You can hear mine from start up to power in that video, once you get past the idling Picco... Glen