I have a YFZ450 rear shock on my blaster. I noticed the other day after did some work, that when i took it off the stand the rear lowered about 3 inches. Then i sat on it and the rear just bottomed out. The shock seems really soft. Do I need a shock rebuild. Whats the problem. I just put on my stock blaster shock and it was more firm than the YFZ one. Thats just not right. Thanks for the help.:">