Valve Inspection

Remove the valves (see VALVE, SPRING, AND VALVE SEAL REMOVAL ).
Measure the valve in these areas.
Intake Valve Dimensions

A Standard (New): 27.85-28.15 mm (1.096-1.108 in.)

B Standard (New): 118.55-119.15 mm (4.667-4.691 in.)

C Standard (New): 5.48-5.49 mm (0.2157-0.2161 in.)

C Service Limit: 5.45 mm (0.215 in.)

Exhaust Valve Dimensions

A Standard (New): 22.85-23.15 mm (0.900-0.911 in.)

B Standard (New): 117.25-117.85 mm (4.616-4.640 in.)

C Standard (New): 5.45-5.46 mm (0.2146-0.2150 in.)

C Service Limit: 5.42 mm (0.213 in.)

Fig 1: Identifying Intake Valve Dimensions
Courtesy of AMERICAN HONDA MOTOR CO., INC.