Mainshaft Inspection

Inspect the gear and bearing surfaces for wear and damage.
Measure the mainshaft at points A, B, C, and D. If any part of the mainshaft is less than the service limit, replace it.
Standard:
1. Rear cover side ball bearing contact area:
  27.987-28.000 mm (1.1018-1.1024 in.)
2. 4th/5th gears contact area:
  34.987-35.000 mm (1.3774-1.3780 in.)
3. 6th gear contact area:
  38.984-39.000 mm (1.5348-1.5354 in.)
4. Clutch housing side ball bearing contact area:
  28.002-28.015 mm (1.1024-1.1030 in.)
Service Limit:
1. A: 27.94 mm (1.100 in.)
2. B: 34.94 mm (1.376 in.)
3. C: 38.94 mm (1.533 in.)
4. D: 27.95 mm (1.100 in.)
  
  Fig 1: Measuring Mainshaft At Points A, B, C And D
  Courtesy of AMERICAN HONDA MOTOR CO., INC.
Inspect for runout by supporting both ends of mainshaft. Then rotate the mainshaft two complete turns while measuring with a dial gauge. 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 Runout
Courtesy of AMERICAN HONDA MOTOR CO., INC.