2000 Yamaha YFM400FWA(M) Factory Service workshop Manual, Page 261Get this manual
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REAR AXLEFINAL DRIVE GEAR AND DRIVE SHAFT
3.Apply: Sealant (Quick Gasket(to the mating surfaces of the swingarm and the final drive gear case) Sealant (Quick gasket): PNACC-11001-05-01 Ya