Mercury Optimax 115, 135, 150, 175, DFI year 2000 and up service manual., Page 20Get this manual

Mercury Optimax 115, 135, 150, 175, DFI year 2000 and up service manual., Page 20

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MAINTENANCE
Inspect spark plugs at the recommended intervals1 Remove the spark plug leads by twisting the rubber boots slightly and pull offInspect spark plug boots and replace if cracked