1991-1993 Yamaha Exciter II-570 Service Manual, Page 131Get this manual
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ENGINE ASSEMBLY AND ADJUSTMENT
Piston ring
Spark plug
First: 20 Nm (2.0 kg, 14 ft Ib) Final: 28 Nm (2.8 kg, 22 ft Ib) 28 Nm (2.8 kg, 20 ft Ib) First: 20 Nm (2.0