Honda BF20A-BF25A, BF25D-BF30D Outboard Motors Shop Manual., Page 386Get this manual
9BREAK-IN PROCEDURES The outboard motor break-in should be performed as follows, although it is usually done during the trial runsFor the initial 15 minutes: Run the outboard motor at idling or trolling speeds (i.ethe lowest possible speed)For the next 30 minutes: Run the outboard motor at
2,0003,000 min-' (rpm) (with 1030 of throttle)