http://www.g2ergo.com/
Excellent product to allow you to fine tune throttle response. This throttle tube is made of aluminium and comes with 3 different cams which change the rate of the slide lifting during the initial period. I use the slowest and find it really helps low speed control. After I fitted it I was at a track with a couple of MXers who are faster than me. Through a flat S bend I gained on them noticeably as they could put power down smoothly. With the G2 throttle I had much better control, cornered smoother and reeled them in - until the grippy bends at least!