2007 Yamaha Apex Factory Service Manual, Page 79Get this manual
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GEAR SELECTION 5 Torque cam (secondary spring seat) Identification mark
51-43_ 47_ 45_ 43_ 41_ 39_
8BVFA 8BV71 8BV51 8BV31 8BV11 8BV91
RX10, RX10S, RX10R, RX10RS