IF THE FAULTS DISCOVERED AFFECT THE HUB, REPLACE THE STARTER RING GEAR AND
FREEWHEEL.
IF ONLY THE BUSHING IS WORN, IT IS POSSIBLE TO REPLACE ONLY THE COMPLETE START-
UP RIM. IN THAT CASE, CHECK ALSO THE DIAMETER AND THE SURFACE OF THE CONNEC-
TION ON THE CRANKSHAFT. IN CASE OR IRREGULARITIES, REPLACE THE CRANKSHAFT.
Intermediate gear
- Check that the toothing is not worn.
- Check the diameter of the two bearings.
Characteristic
Gear bearing diameter:
12 - 0 0.011 mm
Also check the shaft diameter on the flywheel cov-
er and on the engine crankcase.
Characteristic
Bearing diameter on the flywheel cover
12 + 0.034 -0.016 mm
Bearing diameter on the engine crankcase:
12 + 0.034 -0.016 mm
N.B.
THE TORQUE LIMITER IS PROVIDED WITH 4 GEARS THAT HAVE THE FUNCTION OF CLUTCH
DRIVE PLATES.
Driven plates consist of 4 Belleville springs provi-
ded with grooved profiles; this assembly allows
transmitting torque lower than 10 kgm.
In case of incorrect start-up manoeuvres, the lim-
iter prevents any kicks, with consequent reversal
of direction of the crankshaft which would impair
the engine structure.
The limiter assembly cannot be overhauled. In case of irregularities on the toothed discs, replace the
assembly.
Refitting the free wheel
- Make sure the freewheel faying surfaces are in good condition.
- Thoroughly clean the free wheel to remove LOCTITE residue.
Engine X9 Evolution 500
ENG - 134
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