Hi over there, just welcoming 2006 with a bike change. I'm changing my 1998 YZ250 to ride a brand new 2006 YZ450F. If you have suggestions or hints on leaving 2 to 4 strokes, please reply - for now what I have is never to hit the rear brake without clutch in cause thumpers stall easily, and never turn the acel off when jumping as the motor drags the nose down much stronger than 2 strokes. Mostly MX track riding, some trail and hill climbing too. Only ridden a thumper on open trails, never on a track. Let me read your comments, Happy New Year!!