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.

The following removal operations are required in order to renew and/or clean the crankcase halves. If the original crankcase halves are to be reused, then the removal of these components is not essential.

Unscrew the bolt (30) and remove the oil breather valve (10) with the O-rings (11). Check the condition of O-rings (11) and renew them if necessary.

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

Remove the gauze pickup filter (18) with its seal from the clutch-side crankcase half as described in Section D 4, Changing the engine oil and filter cartridge.

Tighten the bolt (30) to the specified torque (Sect. C 3, Engine torque settings).

Fit the seals (8) on the connection fittings (14) on the small diameter sides of the fittings. Apply the recommended threadlocker to the smaller diamater threads of the connections fittings (14).

Tighten the connection fittings (14) to the specified torque (Sect. C 3, Engine torque settings).

Tighten the oil filter support connection fitting (17) to the specified torque (Sect. C 3, Engine torque settings).

Screw in the drain plug (9) with its seal (29) and tighten to the specified torque (Sect. C 3, Engine torque settings), after applying the recommended threadlocker.

Refit the neutral switch (19) with its seal (20) and tighten to the specified torque (Sect. C 3, Engine torque settings).

Apply threadlocker to the plug (27), fit it with its seal (28) and tighten to the specified torque (Sect. C 3, Engine torque settings).

Refit the gauze pickup filter (18) with its seal as described in Section D 4, Changing the engine oil and filter cartridge.

Now fit the studs (12) in the crankcase halves, applying threadlocker and tightening to the specified torque value (Sect. C 3, Engine torque settings). Use a tool of the type shown in the illustration.

Insert the bolt (31) with the washer (32) and tighten to the specified torque (Sect. C 3, Engine torque settings).

Use a feeler gauge to check the clearance between the engine pickup (34) and the timing gear (2). The value must be between 0.6 and 0.8 mm.

If removed, apply threadlocker to the grub screw (35) and tighten it to the specified torque (Sect. C 3, Engine torque settings) and fit the seal (16) to the service plug (15): the seal must be oriented so that the square edge faces the clutch-side crankcase. Apply the recommended threadlocker to the thread of the plug (15) and tighten it to the specified torque (Sect. C 3, Engine torque settings).

On completion of the refitting operations, check that tab washer (3) is staked against nut (4) in such a way as to prevent the nut from working loose.

Remove the starter motor idler gear (23) and shim (22).

Apply the prescribed threadlocker to the bolt (26) and tighten to the prescribed torque (Sect. C 3, Engine torque settings).