OK guys I will try to keep this short. About 10 years ago I bought a Rossi .45 with a tuned pipe. I liked it so much I bought another one. I had carburator problems with that one. Anyway I found a carb off of a .46 os max fx. I mounted it to the Rossi and it seems to work ok, except when I am flying I will point it at the sky and as it is climbing it loses rpm's almost like it is lean BUT I have a good vaper trail coming out of the pipe almost like it is rich. I have noticed this problem recently with the first Rossi I bought. It has a stock Rossi carb on it and I don't really remember this being a problem before. I am running 15 % wildcat fuel. Any advice would be appreciated. Thanks