Countershaft Inspection

Inspect the gear and bearing contact areas for wear and damage, then measure the countershaft at points A, B and C. If any part of the countershaft is less than the service limit, replace it.
Standard:

A Ball Bearing Contact Area (Transmission Housing Side): 30.020-30.033 mm (1.1819-1.1824 in.)

B Distance Collar Contact Area: 39.937-39.950 mm (1.5723-1.5728 in.)

C Needle Bearing Contact Area (Clutch Housing Side): 35.000-35.015 mm (1.3780-1.3785 in.)

Fig 1: Identifying Gear & Bearing Contact Areas For Wear & Damage With Specifications
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Inspect the runout by supporting both ends of the countershaft. Then rotate the countershaft two complete turns while measuring with a dial gauge. If the runout is more than the service limit, replace the countershaft.
Standard: 0.02 mm (0.001 in.) max.

Service Limit: 0.05 mm (0.002 in.)

Fig 2: View Of Runout With Supporting Both Ends Of Countershaft
Courtesy of AMERICAN HONDA MOTOR CO., INC.