Today I pulled the cover off the tranny to see why my grizz was short on power, high range in 2wd wont snap up like a 600 should... mind you its only got 90 miles on it.. I noticed that the belt is ribbed like a snomobile bot the shaft it rides on is smooth??? no grooves, I dont get it. The belt has no real wear, and is plenty tight and logic tells me when the rear wheels stop, the belt is going to spin freely on the shiny smooth shaft. Since neither of the pullys turn while the motor is idleing, I dont know why they would ose a smooth shaft on rummer to drive such a monster? I just couldnt believe my eyes, thought well no wonder... does anyone have an explanation?

00 grizz
86 honda trx 350 4x4
95 jeep wrangler
72 jeep cj5
99 dodge ram 4x4

 

lets see if i can come close.............. the primary sheave that you saw (its the one towards the front of the bike) has weights in it that determine when it engages (centrifugal clutch). if you were to take the belt off of that front "pulley" you would see that it doesn't ride on a shaft, but rather on the walls of that pulley. that is why the belt is so thick. if you were to look at the belt from the side you would notice that the top is much wider than the bottom (looks kind of like a v) so it fits into the v of that front pulley. as the clutch engages it starts out at one point and as rpms increase the weights in the "pulley" force the space between the walls of the pulley (the v) to increase, letting the belt go lower into that pulley which in effect changes the gear ratio. hope this helps some.