Bold reference numbers in this section identify parts shown in this exploded view diagram. These parts do not appear in the figures near the text.

The removal procedure described is only necessary when changing or cleaning the casings. If the original casings are reused, the components may be left in place.

Remove oil breather valve (1) and O-ring (2) from the engine block.

Unscrew and remove the two nipples (8) for oil inlet and outlet from the clutch-side casing and remove their seals (9).

Undo and remove the oil cartridge filter (Sect. D 4, Changing the engine oil and filter cartridge).

Remove mesh filter (26) and seal from the clutch-side casing as described under Sect. D 4, Changing the engine oil and filter cartridge.

Unscrew the retaining screw (28) of the engine sensor (30) and collect the washer (29).

Check the O-ring (31) for wear. Change, if necessary.

If the engine sensor is changed, it is necessary to check the sensor air gap as specified under “Checking the engine sensor air gap”.

Fit washer (29) and tighten the screw (28) to the specified torque (Sect. C 3, Engine torque settings).

Use a feeler gauge to measure air gap between engine sensor (30) and timing gear (13). Correct air gap is between 0.6 and 0.8 mm.

If the air gap is incorrect, loosen engine sensor retaining screw (28) and change shim (24) with a more suitable one (paragraph “Checking the engine sensor air gap”).

Check O-ring (2) for wear. Change, if necessary.

Fit oil breather valve (1) with O-ring (2) inside engine and tighten to the specified torque (Sect. C 3, Engine torque settings).

Tighten the two nipples (8) with oil tube seals (9) to the specified torque (Sect. C 3, Engine torque settings).

Position the by-pass spring (7) and tighten the nipple (6) supporting oil filter cartridge to the specified torque (Sect. C 3, Engine torque settings).

Tighten the drain plug (24) with seal (25) to the specified torque (Sect. C 3, Engine torque settings) after applying the recommended threadlocker.

Refit the neutral switch (4) with seal (3) and tighten to the specified torque (Sect. C 3, Engine torque settings).

Refit mesh filter (26) with seal, as described in Sect. D 4, Changing the engine oil and filter cartridge.

To refit stud bolts (5) on casing, apply speed bond on threads and tighten to the specified torque (Sect. C 3, Engine torque settings). Use the special tool for this operation.

You may now remove the starter motor as described in Sect. P 3, Removing the starter motor.

Apply recommended threadlocker to screw (16), then tighten it to the specified torque (Sect. C 3, Engine torque settings).

Check that air gap is 0.6-0.8 mm.

If this is not the case, loosen sensor (23) screw (25) in order to slide out shim (24) and to change it with one having a suitable thickness.

Tighten the screw (25) to the specified torque (Sect. C 3, Engine torque settings).

Refit plug (B) with seal and tighten to the specified torque (Sect. C 3, Engine torque settings).