The one-way bearing is like $80. You just pull of the stator side cover, pull off the flywheel and the one-way s right there. It's actually bolted to the flywheel, but the bolts are side-punched to keep them from EVER turning out, so you canNOT get them out. You have to drill the heads off. Then put on the new bearing, put in the bolts, side-punch them and reassemble. If you can get the sidecase off without tearing the gasket, all you need is the bearing and the bolts. But I'd go on and get a gasket, just to be safe, it's only a couple bucks. Th eonly specialty tool you have to have is the flywheel puller, but if you take the quad to a shop with the side off and everything, they may do it for you for next to or nothing.
'98/'04 MX Warrior...racing again! LoneStar, Wicked, Works all around, Web, Arias, Noss, DG, Douglas, etc., etc., etc. Gotta go...sponsors to please and Hondas to beat :)