What kind of clutch is in the srx stock i noticed its a different lookin primary and secondary than what are on most sleds.... my buddy has one and teh dealer told him that they have roller or rolling clutches, i forget which term..... But how adjustable are they when it comes to adding or loosing weights to them, and what does spring color indicate? basically.... is it a good stock clutch setup? along with the muffler (can), is that good stock too?