8 - | Final drive

1 | Pin

2 | Rear sprocket flange

3 | Bush

4 | Bearing

5 | Rear sprocket (Z=48)

6 | Nut

7 | Circlip

8 | Spacer

9 | Chain

10 | Screw

11 | Sprocket retaining plate

12 | Front sprocket

13 | Front sprocket cover

14 | Screw

15 | Sprocket flange spacer

Parts catalogue

Gearbox
Front and rear wheels

Important
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.
Inspecting the final drive
To check wear of the final drive, carry out a visual inspection of the front sprocket (12) and rear sprocket (5). If the teeth are found to worn as shown in the figure (dotted line), the sprocket must be renewed.
To check the amount of wear on the chain (9), keep the chain taut and measure 16 links.
If the length (L) is greater than 256.5 mm, the chain should be renewed.
Important
The rear sprocket (5), front sprocket (12) and chain (9) must all be renewed together as a set.
Removal of the front sprocket
Undo the screws (14) and remove the sprocket cover (13).
Slacken the chain (Sect. D 4, Adjusting the chain tension).
Engage a low gear and unscrew the two screws (10) on the sprocket retaining plate (11).
Remove the plate (11) from the gearbox output shaft.
Slide the front sprocket (12) with the chain (9) off the gearbox output shaft and then unhook the chain from the sprocket.
Refitting the front sprocket
Check that the splines of the gearbox output shaft and the sprocket are in perfect condition.
Hook the chain (9) onto the sprocket (12).
Install the front sprocket on gearbox output shaft (B) as shown in the figure. Push the sprocket beyond the groove (A).
Fit the sprocket retaining plate (11) to the gearbox output shaft (B) and turn it in the groove (A) until the holes in the plate (11) are aligned with the threaded holes in the sprocket (12): position the retaining plate with the rounded edge facing the sprocket.
Apply threadlocker to the threads of the screws (10).
Engage first gear.
Tighten the screws (10) to the specified torque (Sect. C 3, Frame torque settings).
Adjust the chain tension (Sect. D 4, Adjusting the chain tension).
Fit the sprocket cover (13) and tighten the screws (14) to the specified torque (Sect. C 3, Frame torque settings).
Removal of the rear sprocket

Operation | Section reference
Slacken the chain | D 4, Adjusting the chain tension
Remove the rear wheel | G 4, Removal of the rear wheel

Slide the complete rear sprocket flange (2) off the rear wheel.
Remove the sprocket flange spacer (15).
Hold the pins (1) at the cush drive bushes steady and undo the nuts (6) securing the sprocket to the flange.
Important
The pins (1) have left-hand threads.
Remove the rear sprocket.
Refitting the rear sprocket
If the bearings (4) were removed, to reinstall them, heat the sprocket flange (2) to a temperature of 180 to 200 °C. Immediately after heating the flange, install the two bearings (4) in the housing. Fit the circlip (7) in the groove in the sprocket flange, over the bearings. The circlip must be installed with its square edge facing outwards.
Notes
Wait for the rear sprocket flange to cool down to ambient temperature before proceeding.
Check that all the pins (1) are screwed down tight into the flange (2). If not, unscrew the pins (left-hand thread) clean the threads and apply threadlocker to the larger diameter thread (A).
Tighten them onto the flange to their specified torque (Sect. C 3, Frame torque settings).
Fit the sprocket (5) to the flange, orientating it so that the side with the recesses for the retaining nuts is facing outwards.
Apply the specified threadlocker to the small diameter thread (B) of the pins (1) and screw on the six nuts (6).
Tighten the nuts to the specified torque (Sect. C 3, Frame torque settings), counterholding the pins and working in a crosswise sequence.
Warning
Perform the above procedure with the utmost care. If even a single pin is not screwed fully into the flange before the nuts are tightened on the sprocket, the sprocket will be installed incorrectly, thus endangering the safety of the rider and the motorcycle.
Install the bush (3) so that is fully seated as shown in the photo.
Locate the flange sprocket spacer (15) on the flange assembly.
Fit the rear sprocket flange (2) to the rear wheel hub. Make sure the pins (1) locate in the corresponding rubber cush drive bushes (G).
Install the spacer (8) with the bevelled side facing the rear sprocket flange.

Operation | Section reference
Refit the rear wheel | G 4, Refitting the rear wheel
Adjust the chain tension | D 4, Adjusting the chain tension