My brother has an 01 426. It runs great but this weekend he had a few problems with stalling. 1st - tight woods, pulled in the clutch and it stalled. Hard to re-start after that. Pulled hot start and it fired up good. 2nd - Drag racing just for fun with a KTM and my YZ-450. After hitting top speed, pulling in the clutch to brake and it would stall. Again, hard to start but using the hot start made it easy to start. Questions: what would cause it to stall when pulling in the clutch after the high speed run? He doesn't have a quick adjust fuel screw and has never messed with the fuel screw, jetting, etc. at all. It was a much hotter day when we were riding as well. Sounds like a low speed jetting/fuel screw issue. Any help?