Plynn41 has good advise. On any mx bike you should have to push on the bars to move the bars when the bikes on a stand. The bars should stop and not move, when you stop pushing on the bars with your palm on a stand. On 04-07 cr125,s you can run up to 110 mm of sag, most bikes you can run more sag than the book says. I rode a pals 01 cr125, no head shake at all. Alot of riders put there body weight on the bars and not on the pegs. Once you relax and keep your body weight on the pegs, you,ll rip.