I know I'm new around here and I did try to find other threads about it before posting..... But does everyone else have to keep their drive chain at the minimum (1.6in) measurement (or a hair under that)? The acceptable range is 1.6in ~ 2.0in according to the service manual. I mine gets anywhere above 1.6in, I get slap in first and second gear if I'm not in the trottle good. One other quick one.....Anyone know if the service manual for the '00 is the same manual you get with the '01? I have an '01 YZ426F and ordered a replacement manual. It looks like it might be the '00 manual. Thanks! jason s.