Honda BF50 (5HP), BF5A Outboard Motors Shop Manual 2014, Page 43Get this manual
BF50BF5A
6CYLINDER HEADVALVES
aDISASSEMBLYREASSEMBLY
CYLINDER HEAD INTAKE VALVEEXHAUST VALVE REASSEMBL Y: Check the valve head for carbon deposits or pitting before installationDo not interchange the intake and exhaust valvesVALVE HEAD DIAMETER: Intake: 25 mm (0.98 in) Exhaust: 24 mm (0.94 in) REASSEMBL Y: Remove the carbon deposits from the combustion chamber Check the valve seat contact before installation Measure the cylinder compression- after installationCYLINDER HEAD GASKET REASSEMBL Y: Check for tears or damage before installation
22-28 Nm (220-280 kg-cm, 16-20 ft-Ib)
VALVE COnERS (INTAKE SIDE ONLY)
PUSH ROD REASSEMBL Y: Check for bent rods and wear at the rods ends.j EXHAUST MANIFOLD GASKET VALVE ROTATOR (EXHAUST SIDE ONLY)