I was riding on a neighborhood road about to hit a dirt trail when i noticed my bike was bogging when i cracked the throttle a bit. I pulled over and put it in neutral while I turned the screw in a 1/2 turn..... while it neutral the idle seemed to drop, then it "clunk" died....I turned the kick starter over with my hand with the decomp lever in, and it kicked one full stroke, then HARD seized! Ran great all weekend! (although it got ridden hard) Damn.... I'm pulling it apart now....Im thinking possibly an oil pump failure? how much does this happen? I checked the oil, it was full and still clean 300 miles ago changed.