the front forks on my 426 are stiff as hell & i would like to soften them up. I'm 215 lbs & ride flat ground, not a lot of jumping. which screw do you turn on the top of the froks to adjust preload & rebound? my cousin said he thought it my be low on fork oil, is there a way i can check for that? also the forks have had the seals replaced by the previous owner. thanks for the help guys.