2003 Arctic Cat ATVs from 250cc to 500cc Service Manual, Page 131Get this manual
11Remove drive gear #2 (B)Account for washers on both sides of the gear 12Remove the sliding dog from the driveshaft
9Remove the idler gear (C)Account for washer and spacer
13Remove the circlip, washer, and drive gear #1 (B) from the driveshaft; then account for the bushing and the spacer