2003+ Mercury Mariner 225 HP EFI 4-Stroke Service Manual, Page 175Get this manual

2003+ Mercury Mariner 225 HP EFI 4-Stroke Service Manual, Page 175

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TIMING, SYNCHRONIZING,ADJUSTING
To prevent personal injury or possible death, from loss of balance or stability while servicing the motor, DO NOT attempt to check timing while boat is in motionF

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