So I’m trying to figure out what changes has taken place in my stock Suspension after break in. Last year I had about 4 hrs on my new 07 YZ450f. Between 4 hrs and 20 hrs the suspension had perfect bottoming control. I could hit anything and no bottoming, front or rear. After 20 hrs the forks began to bottom pretty hard. During the course of the year I’ve done my own oil/seals /bushing maintenance . I’ve used the stock KYB 01 oil. Still unable to return to that initial feeling of bottoming resistance. Anyone have any ideas what causing the forks to bottom so easily now? Could the valving shims be losing their Stiffness after 20 hrs? My 06 yz450f suspension did the same thing the year before… I'm currently changing the oil to Maxima light shock oil, which I believe grayracer is using, to see if there will be a difference. My weight 190 lb with gear , which is close to the spring limit front and rear. Any ideas?