Be sure to read your Engine Owner's Manual, which contains important information about the proper operation, maintenance, warranty and storage of your engine.
Proper engine break-in is critical to the lifespan and performance of your 4-Stroke engine.
In General: 10 Hours of Break-in (Total).
For the First Two Hours of Operation: Start the engine and allow it to reach operating temperature. Get the boat on plane, and operate the engine at up to 4500 RPM's (Important: Vary engine RPM's every 2-5 minutes). Run the engine to FULL THROTTLE for 60 seconds once every 10 minutes (approximately).
Additional Recommendation: Though not listed in Owner's Manuals, it is an excellent idea to have the engine make at least two (2) complete HEAT CYCLES during the first 2 hours of operation. A heat cycle consists of: Ambient temp, start engine, come to operating temp, run engine for at least 5 minutes on plane, return to idle, stabilize engine temp, shutdown engine and allow to cool to ambient temp. Note: Heat cycles CAN be done on different days.
For the Next 8 Hours of Operation: Full throttle may continue to be used, but engine RPM's should be varied/changed at least once every 5 minutes.
After Break-In: Normal operation and Maintenance.
Maintenance Note: Though not REQUIRED, it is wise to consider a 20 hour service (oil/filter and gear lube, plus careful inspection of the engine and retorque of steering, engine mounting, and other critical fasteners). Consider this as an investment in the longevity of your engine.