2007 Yamaha Apex Factory Service Manual, Page 555Get this manual
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GEAR SELECTION Rollers
90386-09001 VESPEL TP-8549 8FG-17624-20 15.6 (0.61)
RX10ML (1.46 mm) GroovedGrooved
90386-09001 VESPEL TP-8549 8FG-17624-30 16.0 (0.63)