Head Assembly; Oil Pump - TOP Perfomance 9931170 Manual Del Usuario

crankcase. In case of interference, remove excess material from
the crankcase while protecting the opening from removed material
and refi t piston and cylinder as previously described.

HEAD ASSEMBLY

Part no. 9931170
– Fit O-Ring (8) inside supplied head slot (7), smearing it with grease
for a better coupling, then insert it on the stud bolts fully home on
the cylinder.
Part no. 9931210
– Fit the head gasket (9) and the original head, duly cleaned from
any carbon deposits, on the stud bolts fully home on the cylinder.
– Tighten the head nuts in a cross pattern and in several steps to a
torque of 12±1 Nm (approx.1.2±0.1 Kgm).
– Fit cover (modifi ed as shown in Fig. 1) on the cylinder, the air
conveyor, and the new spark plug (see section "Important notes").
REED VALVE
– Remove valve from old cylinder and refi t it on the new one together
with the new supplied gasket (11).
– Make sure the reed valve is in perfect conditions. Anyway, it is
recommended to replace it with TOP PERFORMANCES valve
with carbon fi bre fl aps, to solve reliability problems that increased
engine power may cause.

OIL PUMP

– Check the correct operation of the oil pump, that hoses are in good
conditions and that there are no leaks.
– For models with variable-displacement oil pumps, check calibration
according to the indications in the vehicle use and maintenance
handbook.
– Complete the vehicle assembly.
Running-in is very important because it allows all the new parts to
gradually settle. Failure to follow the rules set for the running-in period
could cause damages or strange deformations that would lead to a
loss of power or likely seizure. We therefore recommend to avoid using
the vehicle at its maximum power for the fi rst 300 km.
RUNNING-IN
10