Final drive

8 -	Final drive

Nut

2	Lock washer

3	Front sprocket Z=15

Chain

Screw

6	Front sprocket cover

7	Rear sprocket Z=39

Nut

Washer

Nut

11	Rear sprocket flange

12	Cush drive bush

Bush

Spacer

O-ring

17	Shim washer

Circlip

Washer

Spare parts catalogue


1100 ABS	Gearbox
1100 ABS	Rear wheel axle
1100 S ABS	Gearbox
1100 S ABS	Rear wheel axle

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 the wear of the final drive, visually check the pinion (3) and sprocket (7). If the teeth are found to worn as shown in the figure (dotted line), the sprocket must be renewed.

To check the chain (4), keep the chain taut and measure 16 links.

If the length (L) is greater than 256.5 mm, the chain should be replaced.

Important

The sprocket (7), engine pinion (3) and chain (4) must all be replaced together as a set.

Removing of the front sprocket

Undo the screws (5) and remove the sprocket cover (6).

Loosen the chain (Sect. D 4, Adjusting the chain tension).

Remove the chain with the tool code 88713.1344.

The tool is composed of a holder (A), punch (B), body (C) and two wrenches (D) and (E).

Fit the link to be opened into the holder (A).

Fit a punch (B) into the body (C) and manually unscrew the screw until the punch no longer protrudes.

Fit the holder (A) and link into the body (C).

Manually turn the screw (F) on body (C) so that the punch (B) locates against the pin, taking care that they are aligned with each other.

Fit hex wrench (D) into the hexagonal part of the body (C) and wrench (E) onto the bolt.

Turn the bolt (F) clockwise to push out the pin.

Remove the chain.

Engage a low gear and unscrew the nut (1).

Remove the nut (1) and the safety washer (2) on the pinion.

Remove the engine pinion (3) with the chain (4) from the gearbox secondary shaft.

Remove the spacer (15) with O-ring (16) from the gearbox secondary shaft.

Important

The O-ring (15) must be renewed on reassembly.

Refitting the front sprocket

Refit the ring (17) (Sect. N 9.2, Reassembly of the crankcase halves).

Grease the O-ring (16) and install it on the front sprocket spacer (15).

Fit the spacer, from the O-ring side, on the secondary shaft and drive it fully home against the inner ring of the bearing.

Before refitting the front sprocket, check that the spacer (15) is installed on the gearbox secondary shaft.

Check that the splines of the gearbox secondary shaft and the sprocket are in perfect condition.

Fit the engine pinion (3) and install the safety washer (2).

Tighten the nut (1) to the specified tightening torque (Sect. C 3, Frame torque settings).

Bend the washer (2).

Fit the chain and close it using the tool with code 88713.1344 that was used to open the chain.

The tool is composed of a holder (A), punch (B), body (C) and two wrenches (D) and (E) and link plate holder (F). Connect the two halves of the chain with the external link and manually fit the plate onto the pins.

Warning

Lubricate the pins abundantly; try to avoid touching them with your hands.

Fit the holder (A) onto the external link.

Fit the punch (B) into the body (C) and the plate holder (F).

Fit the body (C) onto the holder (A) which holds the chain in position.

Manually turn the bolt (G) until the plate holder (F) is seated against the plate itself.

Use wrenches (D) and (E) to turn the bolt (G) clockwise until the chain pin is in contact with the holder (F).

Remove the holder (A) from the tool.

Manually turn the bolt (G) until the punch (B) locates against the pin, taking care that they are aligned with each other.

Use wrenches (D) and (E) to turn the bolt clockwise until the punch (B) is seated against the chain plate.

To complete reassembly, repeat the entire procedure with the second pin.

Warning

Carefully check the two pins: the figure shows the correct result of the procedure.

Adjust the chain tension (Sect. D 4, Adjusting the chain tension).

Fit the sprocket cover (6) tightening the screws (5) to the specified torque (Sect. C 3, Frame torque settings).

Replacing 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

Remove the circlip (18) from the nut (8).

Restrain the wheel shaft against rotation and, using a socket wrench, loosen the nut (B).

Fully unscrew the nut (8) and remove the washer (9) and the flange (11) with the sprocket (7).

Recover the spacer with collar (A).

Using a mallet, tap the sprocket flange (10) with the cush drive bushes (12) off the sprocket (7).

Refitting the rear sprocket

Check the cush drive bushes (12) for signs of wear and, if necessary, remove from the sprocket flange and renew them.

Refitting is the reverse of removal.

If it is necessary to remove the cush drive bushes (12), grease all the coupling surfaces and the undersides of the fixing nuts (10) of the cush drive bushes (12) with the recommended grease.

Check for wear following the instructions given at the beginning of this section.

To refit nut (8) and clip (18) retaining the rear sprocket flange, follow the same specifications given for the wheel nut, in Sect. G 4, Refitting the rear wheel.


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

Washing the chain

Chains with O-rings must be washed in oil, diesel fuel or paraffin (kerosene).

Do not use fuel, trichloroethylene or other solvents which will damage the rubber O-rings. For the same reason use only sprays specifically formulated for use with O-ring chains.

Lubricating the chain

O-ring chains have sealed, life-lubed link studs and bushes. However, these chains need lubricating at regular intervals to protect metal parts of the chain and the O-rings.

Lubrication also serves to keep the O-rings soft and pliable to ensure the maximum sealing efficiency.

Using a brush, apply a thin protective layer of high-density gearbox oil along the entire length of the chain both inside and outside (Sect. C 2, Fuel, lubricants and other fluids).