2000 Arctic Cat ATV Factory Service Manual, Page 174Get this manual
Fig3-664
6On the 400500 cc, install the 2nd drive gear and 2nd drive washer onto the countershaftFig3-667
Fig3-665
NOTE: The countershaft is now completely assembled for installationDRIVEN GEAR (400500 cc) Disassembling
1Remove the circlip securing the driven gearAccount for spring washer and thrust washerFig3-668