2007 Arctic Cat ATVs factory service and repair manual, Page 265Get this manual
3Install the 3rd driven lock washer (left side)Lock it into the groove closest to the 5th driven gear (as noted in disassembling) by rotating it when it is in the groove6In order, install the 3rd driven gear, lock washer (right side), and circlip onto the driveshaft 4Install the next 3rd driven lock washer (left side) onto the driveshaft making sure the tabs are facing toward the 5th driven gearMake sure the tabs intertwine with the 3rd driven lock washer