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REPLACEMENT OF THE OIL PUMP
Disassemble both fixing screws (CHC
M5x0.80-16) and remove the defective pump.
Place a new pump equipped with a new torical
gasket putting the transmission blade at the
same level as the axle groove foreseen for this
situation.
Make sure the pump is tightened properly with
two screws.
Assemble the oil inlet tube as well as the
exhaust tube for the carburettor.
Loosen the draining screw and let some oil pour
out until it does not contain any air bubbles any
more.
After this, tighten the draining screw (A) again.
ADJUSTMENT OF THE PUMP
The adjustment of the oil pump is done with the
engine idling and without accelerating.
The control thread must not be pulled taut and
its tolerance in the pump must be between 1 and
2 mm. When you accelerate, the control lever
must not be activated before the engine system
has risen.
Loosen and remove the anchorage screw of the
starting shaft of the upper part of the housing
case (A) (photograph below).
Introduce the starting shaft set in the
transmission cover equipped with the friction
washer (16x25x0.6) making sure you place the
extreme of the spring in its seat (B).
Place the spring and the ratchet launcher facing
the ramp (C) at the end of the spring.
Assemble the starting pinion.
Verify the presence of the housing case centring
bubbles.
Assemble the previously lubricated cover
gasket.
Put the cover (the transmission pinions of the
water pump and the oil have to engage with the
main transmission pinion).
Place the 8 fixing screws (CHC) and tighten
them with a pair of mdaN.
Assemble the starting pedal and activate it to
act on the spring.
When the ramp (C) passes to the bottom of the
thread drill hole of the anchorage screw, screw
this one to the housing case with a pair of 3
mdaN (wrench 16).
The return system of the pedal is operational.
Fix the starting pedal.
ASSEMBLY OF THE STARTING SHAFT AND THE CLUTCH
COVER