Honda BF50 (5HP) BF5A Outboard Motors Shop Manual., Page 50Get this manual
HONDA BF50mBF5A
TIMING GEAR
REMOVAL: 1) Make mark on the crankshaft and timing gear shown2) Remove the timing gear using hydraulic press
INSTALLATION1) Using the old gear for reference, mark line at the same position on the new gear2) Use hydraulic press and the Driver (special tool) to press on the new timing gear with the reference marks aligned[21 DRIVER, 40 mm No07746-0030100