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.

Remove the oil pump assembly (1) and extract the O-rings (2) and (4) from the crankcase half together with two locating bushes (15).

Check that the circlip (3) and tongue (13) are present on the pump.

Insert in the pump the by-pass valve (17), the spring (16) and screw and tighten the plug (14) to the specified torque of 17 Nm (Min.15 Nm - Max. 19 Nm) (Sect. 3 - 3, Engine torque settings) by applying a threadlocker of medium strength.

Position the reference bushings (15) and the oil sealing O-rings (2) and (4) according to the crankcase lubrication channels.

Position the oil pump on the crankcase and tighten screws (9) to a torque of 26 Nm (Min. 23 Nm - Max. 29 Nm) and (10) to a torque of 10 Nm (Min. 9 Nm - Max. 11 Nm) (Sect. 3 - 3, Engine torque settings).

Check the gear clearance with the driving pinion by fixing a dial gauge (A), equipped with the appropriate traces, to the crankcase half.

The clearance should be 0.10 mm.