2006 Arctic Cat Y-6/Y-12 50cc and 90cc Service Manual, Page 85Get this manual
2Slide the axle through the brake disc
5Making sure to direct the flared end toward the sprocket, install the right axle spacer over the axle
3Making sure to direct the flared end toward the brake disc, install the left axle spacer over the axle
6Install the drive chain (see Installing Drive Chain sub-section)7Install the rear wheelhub assembliesTighten the castle nuts to specifications; then install new cotter pins