Hey guys, I have a 2008 RMZ250 with 90 hours on it. The valves haven't moved since I bought it and are still in spec. Recently my bike began bogging (about the time it started getting into the 90's) and it's gotten worse lately. Whenever I'm hard on the gas around 1/2 to wide open my bike seems "bubbly" sometimes. I tried fiddling with the fuel screw and it seemed to help a bit. I turned it all the way in, then out 2 turns. My friends said it sounds cleaner and I didn't notice it bogging. But I thought the fuel screw was just for idling. I'm hoping it's the jetting and not the motor going out. Also, I noticed that my bike doesn't seem to pull like it used to. And today I thought it could be my clutch plates. So we took them off and the smooth ones (drive plates?) are blue/black along the outer edges of them. I put it back together and it seemed to get much worse as the day went on, in fact I cased several jumps because the bike just wouldn't pull like it normally does. I have a race this weekend, and the dealer said that they could get some in by Friday. But I was looking online and all but the Tusk plates which are only $60 costs like $180 dollars. I was wondering if I could get by with just the drive plates(?) and/or some stiffer springs. If not, would there be anything I can do such as sand them down to get me through this weekend? Thanks!