Checking valve clearances
Remove the seat (Removing the seat).
Remove the side fairings (Removal of the side fairings).
Remove the fuel tank (Removing the fuel tank).
Remove the filter box (Removing the filter box), the throttle body (Removing the throttle body), the blow-by and the oil breather hose.
Remove the fuel system and injectors from intake manifolds.
Remove the lower screw retaining water radiator to engine (Removing the water radiator).
Remove the cylinder head cover (Removing the camshafts).
Note
For clarity, the figures show the engine removed from the frame.
Undo the two retaining screws (1) of the cover (2) over the end of the crankshaft.
Fit the tool handgrip part no. 88765.1657 in the holes of the generator cover to be able to turn the crankshaft so that the valve on which the control is carried out is in rest position.
Move the piston of the cylinder being checked to TDC of the power stroke: in this condition, all valves are closed and the camshafts come in neutral position and, therefore, free to rotate; check the valve clearance on the cylinder head you are working on.
Checking the opening clearance
Using feeler gauge (A), check the clearance between the opening rocker arm (3) and the lowest point of the camshaft lobe (4), taking care not to compress the rocker arm return spring. The value must be within the prescribed ones.
If this is not the case, remove the opening shim (5) and replace it with one of a suitable size to obtain the specified clearance.
Note
Opening rocker arm shims measuring 1.80 to 3.45 are available as spare parts: the size is punched on the shim.
Checking the closing clearance
Using feeler gauge (A), check the clearance between the closing rocker arm slider (6) and the highest point of the camshaft lobe (7).
The value must be within the prescribed ones.
If this is not the case, remove the closing shim and replace it with one of a suitable size to obtain the specified clearance.
Note
Closing rocker arm shims measuring 2.2 to 4.5 are available as spare parts: the size is punched on the shim.
Specified values:
   
Assembly value
 
Inspection value, every 24,000 km
 
Opening rocker arm - intake
 
0.13÷0.18 mm
 
0.13÷0.18 mm
 
Opening rocker arm - exhaust
 
0.13÷0.18 mm
 
0.13÷0.18 mm
 
Closing rocker arm - intake
 
0.05÷0.10 mm
 
0.05÷0.10 mm
 
Closing rocker arm - exhaust
 
0.05÷0.10 mm
 
0.05÷0.10 mm
Make sure that O-ring (8) is installed in cover (2).
Refit cover (2) and tighten the two retaining screws (1) to a torque of 10 Nm (Min. 9 Nm - Max. 11 Nm).
Refit the cylinder head covers (Refitting the camshafts).
Refit the lower screw retaining water radiator to engine (Refitting the water radiator).
Refit the fuel system and injectors on the intake manifolds.
Refit the filter box (Refitting the filter box), the throttle body (Refitting the throttle body), the blow-by and the oil breather hose.
Refit the fuel tank (Refitting the fuel tank).
Refit the side fairings (Refitting the fairings).
Refit the seat (Refitting the seat).