Out on the track today for the first few laps I had been making pretty good times. Really muddy out and pretty crappy over all. Like I said though, first few lap times were okay, then when I started to open it up whenever I'd come up to the big doubles my bike would almost "studder". Just about midrange through the throttle. In 3rd that is. When I'd run up to them in 2nd wot, I'd clear the shit out of them and half the time over shoot them, but anything midrange and it wasn't smooth at all. Itd studder and skip and I'd loose momentum. I have a 140 main jet in it right now and the carb is clean as a whistle. The valves are good and overall, the bike is in great condition. Just curious as to maybe what I should do. Obviously a jet issue but my shop is closed for a couple days for the holiday. So, suggestions as to a jet size to go to would be nice. Thanks in advance!