dont know if this is common on the 2004 YZ 450F but the vibrations just numb my hands. I can only do about 5 laps full throttle really racing it hard and then i got to stop. Is there anything i can do or buy to help. Dont know if a set of pro taper bars will help or hand grips something ideas? Maybe i just need to build up some strength. haha! I rode my buddys 06 and it was wonderful i could ride it all day maybe its the pro tapers.