I have recently purchased an 05 yz450f and after riding it the shocks are to stiff, which of the adjustments on the top of the fork tube can I use to soften them up or am I going to have to get them revalved? Wheres/whats a good place to get a manual for this bike? Also what sproket/chain combos to you all recamend. preferably a combo that is ecenomical and durable. Thanks in advance for any help.