1991-1993 Yamaha Exciter II-570 Service Manual, Page 90Get this manual

1991-1993 Yamaha Exciter II-570 Service Manual, Page 90

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SECONDARY SHEAVE SHEAVE DISTANCE AND OFFSET ADJUSTMENT
3 Measure:
Sheave offset Use the Sheave Gauge (-, YS-91047)Out of specification AdjustSheave offset: 14.5 17.5 mm (0.57 0.69 in)