Mainshaft Inspection

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Inspect the gear and bearing surfaces for wear and damage, then measure the mainshaft at points A, B, C, D and E. If any part of the mainshaft is less than the service limit (except E), replace it.
Standard:

A (Ball bearing contact area):

25.987-26.000 mm (1.0231-1.0236 in.)

B (Distance collar contact area):

28.992-29.005 mm (1.1414-1.1419 in.)

C (Needle bearing contact area):

34.984-35.000 mm (1.3773-1.3780 in.)

D (Ball bearing contact area):

25.977-25.990 mm (1.0227-1.0232 in.)

E (Pilot bearing contact area):

14.870-14.890 mm (0.5854-0.5862 in.)

Service Limit:

A: 25.93 mm (1.020 in.)

B: 28.93 mm (1.139 in.)

C: 34.93 mm (1.375 in.)

D: 25.92 mm (1.020 in.)

Fig 1: Identifying Mainshaft Inspection Area
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Inspect the runout by supporting both ends of the mainshaft on V-blocks. Rotate the mainshaft two complete revolutions when measuring the runout. If the runout is more than the service limit, replace the mainshaft.
Standard: 0.02 mm (0.001 in.) max.

Service Limit: 0.05 mm (0.002 in.)

Fig 2: Measuring Mainshaft
Courtesy of AMERICAN HONDA MOTOR CO., INC.