I just bought a 2004 400 Rancher AT, I just had the motor rebuilt, new clutchs and highlifter clutch kit put in. The other day i was ridin, for about 1.5 hrs in what off and on, and it started sliping and finally quit pullin. We left it there for about two hrs and it rode just fine. does anyone know what caused that? could it be heat related? and also what does the motor assy control do? Its on the front of the crank case around the tranny.