1991-1993 Yamaha Exciter II-570 Service Manual, Page 268Get this manual
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CLUTCH TUNING _ CLUTCH TUNING
Color Code Pre-loadSheave Spring:
90501-550J8 W-P-W 30 kg (66lb) 2.25 kglmm (22 Nmm, 126 Ibin) 78.7 mm (3.1 in)
90501-602JO P