i have found with the supertigres i have (3000) it seems to like 0% nitro and 18% oil. with the 0% it no longer tries to bite the hand that feeds it on hand proping. 10% seems to make it want to do that. i am flying one in a 1/4 scale fokker tripe (flair) and putting one in a proctor albratross (projected weight 22 lbs) like they were saying once broke in and carb tweeked it is a very nice strong running engine. i have heard that a o.s. carb also helps but i have not tried it