When I was loading my bike to take it in last wednesday, I was loading it the way I have always loaded my bikes, but this time it was weird. I had the clutch let out enough so that it was catching, so that with some revs it could pull itself up into the truck. Well I kept the throttle and the clutch constant than the bike surges forward stalls and I almost drop the bike on myself. Not a very fun experiance seeing as my truck is really high up. What is the problem? Should I repack the clutch plates or is this just a problem that the '03 YZ450Fs had? Thx for the help.