Did you find doing it easy? just found this thread thinking about doing it since I haven't rode my quad in about a year and starting again has been killing my clutch hand.
Would http://cgi.ebay.com/ebaymotors/Shift-Lever-Gear-Shifter-Yamaha-YZ125-YZ250-YZ426-WR-_W0QQcmdZViewItemQQhashZitem20b470fe93QQitemZ140466257555QQptZMotorcyclesQ5fPartsQ5fAccessories#ht_1799wt_939 work on the warrior to replace the stock shifter