APRILIA RSV4 1100 Factory Service Station Manual page 286

Engine
If deformations or broken material are found on the
sliding surface, replace the freewheel gear (2).
Check the freewheel sliding surface (2) for wear.
Make sure that the woodruff key slot is in perfect
condition.
Remove the needle cage (3) and the roller cage
(4) from their housings on the freewheel (2) and
check the rollers/needles for wear.
Check for wear on the freewheel sliding surface
(2).
Fitting the idle gear
The ratios between the gears of the starter system are:
1. Starter motor 9 teeth;
2. External transmission gear 64 teeth;
3. Internal transmission gear 12 teeth;
4. Freewheel 49 teeth.
ENG - 286
RSV4 1100 Factory