Here's some numbers, rough measurements. If I turn down the AC driven to the edge of the bolt in plates (what are they for??) It would be 240mm diameter vs the pilot 225mm.
OEM on the pilot the belt lays on the CV at idle, but is the AC drive /engine were a bit higher, it would change the lay angle of the belt and I thin clear the CV.
If I turn the AC drive though, then I need to move the engine farther ahead to make up for the smaller diameter...belt too long...if I use the AC belt...Neil said they used stock belt, stock driven....OEM looks narrow in the AC drive.
The ploaris ATV's use the 3211077 which is the same as the pilot OEM belt, the sleds (all?) use the 3211080...I don't have one, but it must be longer and wider if they use a 12" c2c with a 8" drive and 10.6" driven. Any shorter (polaris ATV) but wider belts (sleds)?
xxxxxx--Arctic Cat----xxxxxxxx-------Pilot-------------xxxxxxxx
xxxxx---mm------------inch-------------mm-------------inch
driven---270.00--------10.63------------225.00----------8.86
drive----200.00--------7.87--------------190.50----------7.50
C2C-----314.00--------12.36-------------254.00---------10.00
belt cir--1220.00-------48.03------------1060.00---------41.73