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Message: [QUOTE="julien_d, post: 1381992, member: 98751"] Quite clear, thanks! yeah, that was my thought as well. This would of course be dependent on the bike having been jetting while compression was at the lower end of usable range, or even less than spec. There was about a 30psi difference in compression from when I had previously jetted my bike to this time around. The wiseco piston I installed also had a smaller window in the intake skirt than my pro-x piston. I'm not sure what affect that has on the jetting requirements, if any. The 220 also runs considerably leaner on the jetting than a 200 does, so 140 may not be that far off depending on elevation and temp. My guess is it had more to do with the pilot and needle than the MJ though. I'd like to see the OP go back to the 142 MJ, and keep the smaller pilot jet, then play with needle position and airscrew setting. [/QUOTE]