So in April I bought an 04cr85, for a while the thing ran perfectly, over time it started to lose top end power, a bit from the piston wearing down, and a bit of a sputter from running too rich. I'll start off by saying bottom end rpms run fine since I got the bike till now. But I recently rebuilt the top end, hoping it would fix the problem, yet the engine still sputters in the top end. I have a stock 125 main jet. And purchased the next size down, a 122 main jet. The 122 main jet runs noticeably too lean. And I cant get the bike to have a smooth powerband with either,, first time writing on a forum so any help would be appreciated. Hopefully I can get a vid of how the bike runs up soon