Yamaha 25BMH 30HMH Factory Service Manual, Page 104Get this manual
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CHK ADJ MAINTENANCE INTERVAL CHART
3-3 3-2 3-16 3-16 3-4 3-4 3-16 3-16 3-20 3-23 3-22 3-22 3-22 3-24 3-24 3-22
Check Adjust Cooling water passage Clean Exhaust leakage Check