Those of you who are running the full 250R stock exhaust on your 250X, what main did you go up to? My bike has the F2 racing jet kit with snorkel removed, stock exhaust baffle removed, and no other airbox mods. The kit uses a 133 main and the bike is jetted perfectly. Last night I installed a full system with the older PMB endcap. I ride sea level to around 7,000 feet (at the most). I'm taking the bike out to my riding area tomorrow night to mess with the main before this weekend. I have a 145 and 143 main I can try. I'm thinking about starting with the 143, but I figure if someone already has their main jet dialed in, I'd rather save some trial and error. The guys in the 250R forum are saying that their stock mains were 160 and 170 which would seem like I'm wasting my time with a 145 and a 143... Thanks in advance.