2004 WR450F. Had a leaky fork seal when I bought it. It was of course wiped clean before I got there so didn't notice. No idea how long it had been leaking or how much oil was actually left in it. Took the forks off replaced the seals with moose racing seals and fresh 5W oil. At some point there was suspension work done to the bike. The springs are way too heavy to be stock as I have never found a birt bike with stiff enough spring for me with stock springs. I run 250-275. These seem to be very close and give almost perfect sag for me. The person I bought the bike from couldn't have done the change as his little 150LBS body would not have needed springs like it has. I don't know what the valving is or what oil was in it. The oil came out pretty dark. Have no idea what the orignial color was but never remember seeing fresh fork oil that dark. The damper rod could be moved by hand. There was good resistance but it was smooth and was not so much resistance it was difficult to move. No free play or binding in the bushings when moed without the spring. No marks on the tubes.
Now After I did the seal change and the fresh oil the forks are really stiff. Stiff enough for me to notice right away that they were stiffer than before the seal/oil change. As soon as I sat on it, not even a ride. I did make sure the forks are still parallel as close as I can measure. The seals are good now with very clean dry tubes.
I guess I can change the compression dampening to see how it loosens up but I just find it odd that it was so much more stiff. HAve not had this off road yet as I was worried about how hard the forks were.
So I guess the question is could I have messed something up to get this big of change, or was it just that bad before I did the seals/oil? What should I be checking? Beside compression damping anyway to make the start of the stroke more supple.
Edited by 300lbsgorilla, August 21, 2014 - 11:48 AM.