Yamaha 25BMH 30HMH Factory Service Manual, Page 84Get this manual
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SPEC Item PISTON RING (2nd) Type (B) (T) End gap (installed) Limit Side clearance Limit CRANKSHAFT Crank width
mm (in) mm (in) mm (in) mm (in) #
0.03 (0.0012) 0.20.7 (0.00790