Bold reference numbers in this section identify parts not shown in the figures alongside the text, but which can be found in the exploded view diagram.

Remove the bolts (18) and (20), and the spacer (19) and withdraw the gear selector mechanism complete with the gear lever shaft, spring and stop plate.

If the components of the gearchange mechanism were dismantled on removal, fit the spring (17) on the shaft (16) in the position indicated in the photo. Grease the threaded end of the eccentric gearchange lever pin (15) and install it on the upper part of the gearchange lever, securing it with the nut (13). Screw the nut on by hand (do not tighten).

Ensure that the shaft with lever (16) is positioned correctly relative to stop plate (23). The edges of the plate must be equidistant from the pin of the lever; to adjust the position, loosen the locknut (13) and turn eccentric pin (15).

Tighten the nut (13) to the specified torque (Sect. C 3, Engine torque settings).

Unscrew the interlock plunger screw (5) and remove seal (6), spring (7) and detent ball (8).

Unscrew the clutch-side crankcase screw (3) and remove the pawl (4), washer (2) and spring (1).

On the special bolt (3), fit the gear pawl lever (4), orienting it as shown in the figure, the washer (2) with the square edge side (D) facing the clutch-side crankcase, and the spring (1), positioning it so that the hook end (A) is facing the gear pawl lever. Locate the hook end (A) of the spring on the gear pawl lever as shown in the figure.

Start the bolt in the crankcase half. Position end (B) of the spring so that it rests against rib (C) of the crankcase half, as shown in the figure. Tighten the bolt (3) to the specified torque (Sect. C 3, Engine torque settings). Check that the spring functions correctly by manually moving the gear pawl lever.

Apply grease and then fit the ball (8), spring (7), and seal (6) into interlock plunger (5) and screw the interlock plunger assembly into the crankcase.

Tighten the gear interlock plunger to the specified torque (Sect. C 3, Engine torque settings).

Fit the service tool no. 88713.3334 on the selector claw.

Position the service tool so that the locating dowel (A) engages the hole in the tool and pin (B) of the tool is engaged in the selector claw, applying hand pressure at point (C) and pressing to the right.

In this position, tighten first the gearchange mechanism retaining bolt (18) and then bolt (20) to the specified torque (Sect. C 3, Engine torque settings).

With the gearbox in neutral, check that the lever travel is the same when shifting up and down. The same should apply when a gear is engaged.

Operate the gearchange lever and turn the front sprocket at the same time to check that all the gears engage when shifting up and down.