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 procedure can also be carried out with the engine installed in the frame. For clarity, the photos show the engine removed from the frame.

If necessary, remove the studs (12) and (13) from the cylinder heads.

Apply the recommended threadlocker to the stud bolts (12) and (13), install them on the cylinder heads and tighten them to a torque of 15 Nm (Min. 13 Nm - Max. 17 Nm) (Sect. 3 - 3, Engine torque settings).

Tighten the nuts (14) to a torque of 23 Nm (Min. 20 Nm - Max. 26 Nm) (Sect. 3 - 3, Engine torque settings).

When removing the covers, take care not lose the tongues (15) located on camshafts (16) and (22).

Unscrew the screws (21) of the cover (20) of the camshaft (16).

In the ABS version, the ABS pipe support (A) is fixed to the cover (8) of the exhaust-side vertical cylinder head. Loosen the screws (B) and remove the support.

Loosen the retaining screws (7) of the valve covers (8) and remove the covers with relative O-rings (9).

Always fit new O-rings (9) when refitting.

Fix the valve covers (8) with the relative O-ring (9) to the cylinder head.

Tighten the screws (7) to a torque of 10 Nm (Min. 9 Nm - Max. 11 Nm) (Sect. C 3, Engine torque settings).

In the ABS version, the ABS pipe support (A) is fixed to the cover (8) of the exhaust-side vertical cylinder head. Refit the support (A) and tighten the screws (B) to a torque of 10 Nm (Min. 9 Nm - Max 11 Nm) (Sect. 3 - 3, Engine torque settings).

This operation can be carried out with the rocker arms installed in the cylinder head. For clarity, the photos show the cylinder head with the opening rocker arm removed.

To prevent possible damage to components, turn the camshaft (16) through a series of rotations so that the cams do not foul the rockers.

Check the cam contact surfaces for scratches, grooves, steps and waving. Worn cams are frequently the cause of poor timing, which leads to loss of engine power.

If the valve rocker arms are already installed in the cylinder head (Sect. 9 - 4.4, Refitting of the rocker arms, shims and valves.), turn the camshaft (16), through a series of rotations, so that the cams do not foul the rocker arms.

Tighten the screws (21) to a torque of 10 Nm (Min. 9 Nm - Max. 10 Nm) (Sect. C 3, Engine torque settings).

Locate the cover (2) of the vertical cylinder head (10) on the left-hand side of the cylinder head and insert the retaining screws (1) and (18).

Tighten the screws (18) and (1) to a torque of 10 Nm (Min. 9 Nm - Max. 11 Nm) (Sect. 3 - 3, Engine torque settings).