1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 312Get this manual

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Troubleshooting Determining if Problem is Electrical or Hydraulic
Outboard thumps when shiftedRefer to "Hydraulic System Troubleshooting Outboard trails out when backing off throttle at high spe

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