Exploded View

Fig 1: Exploded View Of Mainshaft With Torque Specifications

Courtesy of AMERICAN HONDA MOTOR CO., INC.

NOTE: Refer to the EXPLODED VIEW as needed during the following procedure.

Remove the 42 x 63.5 x 3.5 mm thrust needle bearing (A), 3rd gear (B), the 42 x 49 x 23 mm needle bearing (C), and the 47 x 64 x 3 mm thrust needle bearing (D) from the mainshaft (E).

Fig 2: Removing Thrust Needle Bearing, 3rd Gear, Needle Bearing And Thrust Needle Bearing From Mainshaft
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Remove the set ring (F) and the 32 x 40 x 23 mm needle bearing (G).
Place 4th gear (A) on press bases (B), and place a spacer (C) between the mainshaft (D) and the press to prevent damaging the mainshaft.

Fig 3: Identifying 4th Gear, Press Bases, Spacer And Mainshaft
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Remove the 3rd gear collar (A), the 3rd/6th clutch (B), 6th gear (C), and 4th gear (D) using a press.

Fig 4: Identifying 3rd Gear Collar, 3rd/6th Clutch, 6th Gear And 4th Gear
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Remove the O-rings (A) from the mainshaft (B).

Fig 5: Identifying O-Rings, Mainshaft And Sealing Rings
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Remove the sealing rings (C) from the mainshaft.
Inspect the bearings for galling and rough movement.
Check the shaft bearing surfaces for scoring and excessive wear, and check the shaft splines for excessive wear and damage.
Inspect 6th gear for wear and damage, and inspect the 6th gear bearing for wear and rough rotation.
Replace the 6th gear if the gear or the bearing is worn or damaged.