2007 Arctic Cat ATVs factory service and repair manual, Page 267Get this manual
10Slide the reverse driven gear bushing onto the shaft making sure the oil port in the bushing aligns with the oil port on the shaft A CAUTION
Failure to align the oil ports will result in serious engine damage
11Move the washer in the shaft groove until the notches in the washer align with the tabs on the bushing; then slide the bushing up tight against the washer