Honda BF50 (5HP) BF5A Outboard Motors Shop Manual., Page 18Get this manual
IllMAINTENANCE 1ENGINE OIL 2GEAR OIL 3SPARK PLUG 4VALVE CLEARANCE 5FUEL LINE FILTER 6FUEL TANK FILTER
7CARBURETOR 8THROTTLE CABLE 0THROTTLE OPENER SYSTEM 10SHIFT ROD 11REVERSE LOCK
1ENGINE I
NOTE: Draining can be performed rapidly and completely while the engine is still warm1) Remove the oil filler capldipstick and drain plugAllow the oil drain completely2) Reinstall the drain plug and tighten it securely3) Fill the crankcase with the recommended engine oil to the upper level mark the dipstickCheck the level with the dipstick resting the filter opening (do screw in)