5 - | Rear swingarm

1 | Drive chain slider

2 | Screw

3 | Special bolt

4 | Circlip

5 | Washer

6 | Rubber bush

7 | Rear swingarm

8 | Nut

9 | Ring

10 | Rear wheel axle

11 | Slider

12 | Adjuster screw

13 | Rear mudguard

14 | Pin

15 | Screw

16 | Nut

17 | Shim

18 | Swingarm pivot shaft

19 | Screw

Parts catalogue

Swingarm and drive chain

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.
Removal of the swingarm

Operation | Section reference
Remove the rear wheel | G 4, Removal of the rear wheel
Remove the final drive assembly | G 8, Final drive
Remove the rear brake caliper | G 6, Removal of the rear brake system
Remove the footrests | H 4, Removal of the footrest brackets
Remove the shock absorber from the swingarm | G 7, Removal of the rear shock absorber

Unscrew the screws (2) securing the drive chain slider (1) and remove it from the swingarm.
Counterhold the nut (16) and loosen the screw (15) on the left side of the swingarm.
Drive out the pivot shaft (18) using a suitable drift until the swingarm is free of the engine.
Remove the swingarm (8) from the frame.
Recover the two shims (17).
Inspecting the swingarm pivot shaft
Measure the swingarm pivot shaft (18) runout using a dial gauge:

- | place the pivot shaft (18) on two reference blocks of the same size;

- | rotate the shaft and move the gauge horizontally;

- | read off the runout.

Service limit: (0.3 mm) (Sect. C 1.1, Rear wheel).
Renew the pivot shaft when distortion exceeds the specified limit or if cracked or otherwise damaged.
Checking swingarm endfloat
The shim thicknesses (17) are to be determined on refitting the swingarm.
Check the endfloat as follows:
insert a 1.8 mm shim (17) on either side of the engine;
hold the left arm of swingarm (8) against the engine and measure the clearance on the other side of engine using a feeler gauge or calibrated shims.
The maximum permissible endfloat is 0.1 mm.
When a 0.10 mm feeler gauge or shim can only be inserted with difficulty, there is no need to install any further shims. Otherwise, use the two available shim sizes (0.20 mm and 0.10 mm) to obtain the specified endfloat.
Example:

Measured endfloat | Shims on left-hand side. | Shims on right-hand side
0.10 | - | 1 x 0.10 mm
0.20 | 1 x 0.10 mm | 1 x 0.10 mm
0.50 | 1 x 0.20 mm | 1 x 0.20 mm+ 1 x 0.1 mm

Important
The thicker of the two shim packs must always be installed on the right-hand side of the swingarm.
The thinnest shim should always be installed so that it is contact with the swingarm.
NEVER install 0.1 mm shims on the left-hands side.
The maximum thickness of the left-hand shim pack must be 2 mm (1.8+0.2 max.).
Side-to-side movement of the rear end of the swingarm must be below 1 mm.
Refitting the swingarm
Grease both faces of the shim (17) you have selected after measuring endfloat (see paragraph “Checking swingarm endfloat” in this chapter). Locate the swingarm (8) on the engine interposing the selected shim (17) on the left-hand side.
Grease the pivot shaft (18) and insert it from the left side of the swingarm together with circlip (5). Insert the shaft to about half its length. Push the left arm of swingarm against engine and fit between the right arm and the engine the shim thickness (17) determined after measuring the endfloat. Fully insert the swingarm pivot shaft taking care not to damage the shims (17).
Fit the other circlip (4). Tighten the screws (17) to the specified torque (Sect. C 3, Frame torque settings).
Refit the drive chain slider (1) to the swingarm with the screws (2) and hooking the tab (A) over the left-hand side of the swingarm as shown in the photo.
Tighten the screws (2) to the specified torque (Sect. C 3, Frame torque settings).

Operation | Section reference
Refit the shock absorber and tie-rod to rear swingarm | G 7, Reassembly of the rear shock absorber
Refit the vertical cylinder exhaust pipe | L 8, Refitting the exhaust system
Refit the rear brake caliper | G 6, Refitting the rear brake system
Refit the final drive assembly | G 8, Final drive
Refit the rear mudguard | E 4, Refitting the front mudguard
Refit the rear wheel | G 4, Refitting the rear wheel