So i bought the sx from a friend, hopped on it this year, thing is still on stock jetting, bike basically brand new with only 60h on it, 10ish hours on new top end. With stock settings, 158 main, 42 pilot, N1E1 needle, 2 turns out on air screw. This matches up to the stock settings for around 1500ft altitude and 15-25 degrees ontario canada. Checking the plug, it was a very light brown so clearly running lean. Reading on MXA their review of this bike, they go to 160 main, leave on 42 pilot and put in N1EH needle on 3rd clip, 1 1/2 air screw, this jetting definitely helped but the thing has a really bad idle surge still, and if you hold the throttle steady, anywhere on the throttle except wide open, once the bike reaches its kind of equilibrium with very low load it stutters like crazy. My rm 250 2006 runs amazing, bought it with current jetting so i by no means have any experience jetting this but i know how the bike should run which this 250sx clearly isnt. I read going with a suzuki NECJ needle is a good fix for the low end stutter so i think im going to go with that and give it a try. Going with the MXA jetting, the needle is richer, and main jet is richer. So my plug is slightly darker brown but is still a fairly light brown, but the plug was very wet around the outside. I kind of assume the wetness could just be from when i shut it off with the engine not firing? Im going to go buy some larger jets and that suzuki needle and give it another try. As for the idle surge, i read that means bike is lean so hopefully all of what i have read is correct and i just gotta give this thing more fuel. one last thing is the bike is supposed to be mixed 60:1, and im running it 50:1, i don't like the idea of going with so little oil. Could this be part of the problem? Any suggestions for how much larger of a main or pilot to go with? thanks for any responses.