I recently picked up my new Yamaha 600 XTC. I was really impressed However, one of the big things advertised about the sled was the “loads of pre-load” on the suspension. The problem is; there is no wrench in the tool kit to accomplish the pre-load adjustments. One person at the dealer told me that only the dealer should make the pre-load adjustment!!! (What a joke!) Someone in service told me I could ORDER the needed wrenches for $60! What is going on? Did Yamaha market their “premium ride” sled with “loads of suspension pre-load” that the consumer can’t adjust on his own?!!
There are really two separate adjustments that can accomplish “effective” preload adjustment of this rear suspension. The easy one is the three position slotted adjustment at the front mounting point of the rear shock. By loosening the bolt and moving it to a different position you change the effective pre-load, but more accurately you are changing the shock leverage ratio. This is the easy one. The true pre-load adjustment is the spring length on the shock, and Yes, this does require special wrenches. But, you only have to mess with this one if the slotted adjustment doesn’t do the job. The dealer was simply getting too technical with you. He should have explained the slotted adjustment, as this is the one being touted as being so easy to adjust.