Checking the engine timing
Remove the seat (Removing the seat).
Remove the side fairings (Removing the fairings).
Remove the fuel tank (Removing the fuel tank).
Remove the airbox, the blow by and the oil breather pipe (Removing the airbox).
Remove the supply system and the injectors from the intake manifolds (Removing the throttle body).
Remove the water radiator lower retainer from the engine (Removing the water radiator).
Remove the cylinder head covers (Removing the camshafts).
Remove the vertical head exhaust pipe (Removing the exhaust system).
Remove the timing belt covers (Removing the timing belt external covers).
Note
For clarity, the figures show the engine removed from the frame.
Move the piston of the cylinder being checked to TDC upon combustion stage: in this condition, all valves are closed and the camshafts come in rest position and, therefore, free to rotate.
Install tool no. 88713.2087 (A) in the spark plug bore to determine the piston TDC, the gauges (B) on tool no. 88765.1690 and the timing check tool (C) no. 88765.1657 (degree wheel with graduated disk).
Set the opening valve clearance to zero when the camshafts are in rest position by fitting a feeler gauge, of suitable thickness, between the upper rocker arm and the opening shim.
Check that in this condition the camshaft can rotate. If it moves stiffly, use a thinner feeler gauge.
In this condition, with the piston of the horizontal cylinder at TDC with the valves fully closed as confirmed by the reading on gauge (A), set the gauges (B) to zero.
Tension the belts to the specified value.
Turn the degree wheel (C) counter clockwise until the gauge dial (B), on the exhaust side, shows a lift of 1 mm.
Check that the value of the angular displacement read on the degree wheel (C) is the specified one.
Continue to rotate in the same direction until you obtain a lift of 1 mm on the intake side.
Check the angular value on the degree wheel.
Continue to rotate until you obtain an intake valve lift of 1 mm on the gauge (B), during closure of the valve for the compression stroke.
Check the angular displacement value with the specified one.
Continue to rotate the degree wheel (C) counter clockwise until you obtain a lift of 1 mm of the exhaust valve, when opening or closing the valve.
Check the angular displacement value against the specified value.
Repeat the procedure for the vertical cylinder.
A tolerance of ±3° is allowed in the values detected with the described procedure compared to the specified ones.
Remove the installed tools to check timing. Then tension the belts to the prescribed operation value.
In case of values different from the described ones, loosen the fixing screws (D) of the timing belt rollers and correct the value detected by turning the ring nut of the timing shaft with the supplied wrench (E) no. 88713.1806.
Then block the three screws (D) retaining the timing belt roller to a torque of 10 Nm (Min. 9 Nm - Max. 11 Nm) and mark the new position on the components.
Specified values:
 
Adjusting the belt tension
   
Reference
 
Assembly value (new belt)
 
Recovery value (used belt)
 
Cold belt tension adjustment
 
DDS
 
110±5 Hz (horizontal)
 
80±5 Hz (horizontal)
 
110±5 Hz (vertical)
 
80±5 Hz (vertical)
 
Cold min. limit value
   
70 Hz
 
Tension value accepted upon engine overhaul
 
HORIZONTAL
 
VERTICAL
 
Tension (Hz) ±5
 
Tension (Hz) ±5
 
Min. 80
 
Min. 88
 
Max. 100
 
Max. 100
 
Timing diagram
 
Timing diagram with valve clearance of 1 mm
 
Intake
 
Opening 4° B.T.D.C.
Closing 52° A.B.D.C.
 
Exhaust
 
Opening 58° B.B.D.C.
Closing 7° A.T.D.C.
 
Intake valve diameter
 
35.5 mm
 
Exhaust valve diameter
 
28.8 mm
Refit the timing belt covers (Refitting the timing belt external covers).
Refit the cylinder head covers (Refitting the camshafts).
Refit the water radiator lower retainer on the engine block (Refitting the water radiator).
Refit the vertical head exhaust pipe (Refitting the exhaust system).
Refit the supply system and the injectors from the intake manifolds (Refitting the throttle body).
Refit the airbox, the blow by and the oil breather pipe (Refitting the airbox).
Refit the fuel tank (Refitting the fuel tank).
Refit the side fairings (Refitting the fairings).
Refit the seat (Refitting the seat).