Exploded View

Fig 1: Exploded View Of Mainshaft Assembly

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: Identifying Mainshaft Needle Bearings
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Remove the set ring (F), the 32 x 40 x 23 mm needle bearing (G), and the sealing rings (H).
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: Placing 4th Gear On Press Bases And Spacer Between 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: Locating 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: Locating O-Rings And Mainshaft
Courtesy of AMERICAN HONDA MOTOR CO., INC.
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 6th gear if the gear or the bearing is worn or damaged.