APRILIA MSS Mana GT ABS Service Station Manual page 168

Engine
Also check the diameter of the bearings on the fly-
wheel cover and on the engine crankcase.
Characteristic
Diameter of bearing on the flywheel cover
12 (+0.034; - 0.016) mm (0.47000 (+0.0013;
-0.0006) in)
Characteristic
Diameter of bearing on the engine crankcase
12 (+0.034; - 0.016) mm (0.47000 (+0.0013;
-0.0006) in)
NOTE
THE TORQUE LIMITER IS EQUIPPED WITH 4 GEARS THAT FUNCTION AS CLUTCH DRIVING
PLATES.
Driven plates consist of 4 Belleville springs with
grooved profiles; this assembly allows transmitting
torques below 100 Nm (73.75 lbf ft).
In case of incorrect start-up procedures, the torque
limiter prevents any kicks, resulting in inversion of
rotation direction of the crankshaft which would
impair the engine structure.
The limiter assembly cannot be overhauled. In case of clearly visible irregularities on the toothed discs,
replace the assembly.
ENG - 168
MSS Mana GT ABS