Majes, I have the .90 version of the RCV to put on my Bruce Tharpe FlyinKing, it was noisy and ran terrible for the first 1/2 hour then magically the gear whine went away and and it smoothed out. Part of the smoothness came from changing the plug from the OS-f to a Hangar Nine Super Plug. The Super Plug also made it idle better, after about one hour I tried an OS-f, a Fox Miracle plug and the H9 Super Plug, the Super plug was still better at idle, with all three it would turn an APC 15x12 four blade at 5,000 rpm, on WildCat Premium Extra 10%. A friend of mine flew his 120 RCV after only 12 OZ. of fuel were put through it, it took this in stride.