2000 Yamaha YFM400FWA(M) Factory Service workshop Manual, Page 172Get this manual
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PRIMARY AND SECONDARY SHEAVES
100 Nm (10.0 kg, 72 ft lb) 100 Nm (10.0 kg, 72 ft lb)
Nut (secondary sheave) 2
NOTE: Use the sheave holder to hold the primary sheaveFirst, tight