How do I perform engine break-in procedures?
Follow the recommended daily inspection checklist and idle the engine at a steady rate for 10-20 minutes until warm, then accelerate gently to a higher throttle position (but not full speed) maintaining each RPM level incrementally for an additional ten minutes. Refer to the manual for specific model guidance on break-in procedure details and durations. (Page 67)
From the official Mercury Outboard Motor manual, page 67
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