Looking through chickenhauler's faq, it seemed like the 250's were left out, so I'll start this. Stuff that might be helpful: altitude and temps where you ride riding style (pokey lugging woods rider, revving desert fanatic, mx racer, etc..) aftermarket pipe and/or silencer main, needle, needle clip, pilot, air screw settings spooginess, with mix ratio and oil brand I've only got 8 hrs or so on the bike. I'm currently at 160 main nftg (stock needle) clip#1 42 pilot 1.5 as riding, lugging in the woods at 4000-6000', and 30-70 degrees the bike runs very well at the upper end of that range, and has a little 'kak-kak-kak' feel to it at small throttle openings, middle revs in the deepest coldest canyons. I think perhaps the needle is slightly lean there. spooge is minimal from back of pipe, but messy from the pv vent, running 32-1 maxima. Next tank I'll be switching to my normal amsoil dominator at 40-1 and I'll do further testing. Based on my lugging riding style, I may try a hotter plug. At least 1 other poster in here reported going to a br7 worked for him to de-spooge in woods conditions. Anyone think I can drop that main further? esp if I go back to clip #2 on the needle?