1991-1993 Yamaha Exciter II-570 Service Manual, Page 270Get this manual
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_ _ GEARING SELECTION High Altitude Tuning For EX570(E)
1733 (1.94) 89J-17682-70 17T 89J -47587 -30 33T 94860-02068 68
Drive gear
[EJ Part No[EJ Teeth
Driv