I got a 98 YZ400 for $900. It is a beast and i love it. I believe it to have been raced and set up well but neglected in recent years. I am 240lbs and the springs are a little soft. I ride mostly in tight woods ans single track but do jump it whenever i get to. The forks have about 2.5-3 inches of sag without me on the bike. What caused this and how do i fix it in a cheap way? Also, what should i do as far as preventive maitnence? I change oil and clean/change filter every 2 rides and have already dealt with the drive chain adjusters. I sometimes hear a click in it when i crack it open at lower RPM.