2000 Yamaha YFM400FWA(M) Factory Service workshop Manual, Page 309Get this manual

2000 Yamaha YFM400FWA(M) Factory Service workshop Manual, Page 309

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REAR SHOCK ABSORBER AND SWINGARM SWINGARM REMOVAL 1.Inspect: Swingarm free play
the swingarm side play by moving it from side to sideIf side play is noticeable, check the bushing and frame pivot