the pitch, or the space between each drive lug.
look up what is stock for your sled.
i believe most poo and skidoos are 2.52. I have interchanged many tracks between these two companies. I'm not sure on the yamahas though.
1992 Polaris RXL 650 EFI 1990 Skidoo Formula MX 470 1997 Skidoo Grand Touring 500 1997 Arctic Cat Pantera 580 1979 Ford F150 ~360 5.9L, Edelbrock intake, 4bbl carb, 4 speed, divorced transfer case, 3" body lift, 3" suspension lift, 33's, redone interior. 2003 Dodge 3500 srw 6spd
up to 1.5" using 8 tooth drivers, 1" max on the stock 9 tooth.
if your interested, i have a like new .92(7/8") lug track made by camoplast for skidoo, $200 to your door. if you want to go taller lugs, i have a driveshaft with 8 tooth drivers available that will fit your sled.