Ducati MONSTER 620 2002 Manuel D'utilisation page 136

Transmission
Multiple-plate wet clutch ;
operated by a control lever on left handlebar.
Drive is transmitted from engine to gearbox main shaft
via spur gears.
Front sprocket/clutch gear ratio:
33/61.
Gearbox:
5-speed;
with constant mesh gears, gear change pedal on left side
E
of motorcycle.
Transmission sprocket/rear sprocket ratio:
15/46.
Total gear ratios:
1 st gear 16/40,
2 nd gear 21/36,
3 rd gear 24/32,
4 th gear 27/29,
5 th gear 29/28.
64
Drive chain from gearbox to rear wheel:
Make:
DID
Type:
520 VL4
Size:
5/8"x1/4"
Links:
106.
Important
The above gear ratios are the homologated ones
and under no circumstances must they be modified.
However, if you wish to tune up your motorcycle for
competitive trials, you may refer to Ducati Motor Holding
S.p.A. who will be glad to provide information about the
special ratios available. Contact a Ducati Dealer or
Authorized Workshop.
Warning
If the rear sprocket needs replacing, contact a
Ducati Dealer or Authorized Workshop. If improperly
replaced, this component could seriously endanger your
safety and that of your passenger, and cause irreparable
damage to your motorcycle.