Yamaha 25BMH 30HMH Factory Service Manual, Page 302Get this manual
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DRIVE SHAFT
Drive shaft holder 90890-06517 2 Tighten: Pinion gear nut Pinion gear nut 50 (5.0 kgf m, 37 ft lb)
Tightening steps (1) Apply 12mm wrench on the pinion gear nut(2