APRILIA MSS Mana GT ABS Service Station Manual page 170

Engine
IF ONLY THE BUSHING IS WORN, REPLACE ONLY THE COMPLETE STARTING RING GEAR.
ALSO CHECK THE DIAMETER AND THE SURFACE OF THE BEARING ON THE CRANKSHAFT.
IN CASE OF IRREGULARITIES, REPLACE THE CRANKSHAFT.
Installing the starter gear
- Lubricate the internal bushing and the starter ring
gear hub surface.
- Fit the starting ring gear on the flywheel by turning
it clockwise and inserting the gear at the same
time.
ENG - 170
MSS Mana GT ABS