2000 Yamaha YFM400FWA(M) Factory Service workshop Manual, Page 122Get this manual
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ENG MIDDLE GEAR 4-75 MIDDLE DRIVE SHAFT .4-75 MIDDLE DRIVEN SHAFT 4-76 MIDDLE DRIVE SHAFT REMOVAL 4-78 MIDDLE DRIVEN SHAFT REMOVAL .4-78 INSPECTION .4-80 MIDDLE DRIVE AND DRIVEN GEAR SHIM SELECTION 4-