I was unable to even start the engine with the suggested factory settings, especially the low speed needle valve. When I did find a setting that would allow it too start and then trying to tweak it from there the engine ran erractic and I was unable to get over 10,000 using a modest prop. I had the plane to the field about 6 times trying different things and gave up. Maybe I just got a bad one or maybe I was just doing something wrong. I have OS in 40, 46, and 61 size, TH in 61 and 75 size, and ASP Super Series in 52 size engines and like them all because they have never gave me problems tuning or breaking in so thats what I am sticking with. The OS 61 runs very reliably but has only modest output for its size. Thats why my favorite is the TH and bump it up to the 75 size.
