These are the known mechanical and performance specifications for your 2004 Ducati Monster 620 i.e..
Basic Specs

Engine
Displacement618.00 ccm (37.71 cubic inches)
Type
DetailsV2, four-stroke
Max RPM
Compression10.5:1
Bore/Stroke80.0 x 618.0 mm (3.1 x 24.3 inches)
Valves/Cylinder2
FuelingInjection
Ignition
Exhaust
Lubrication
CoolingAir
Performance
Horespower60.00 HP (43.8 kW)
Torque53.30 Nm (5.4 kgf-m or 39.3 ft.lbs)
Top Speed
Fuel Economy & Polution
Fuel Consumption
Fuel Capacity15.00 litres (3.96 gallons)
Emissions
Chassis
Frame TypeTubular steel trellis
Rake24.0°
Trail
Front Suspension43 mm upside-down
Front Travel130 mm (5.1 inches)
Rear SuspensionProgressive linkage with Sachs adjustable monoshock.
Rear Travel148 mm (5.8 inches)
Seat
Seat Height770 mm (30.3 inches) If adjustable, lowest setting.
Alt. Seat Height
Total Height1,212 mm (47.7 inches)
Total Length2,100 mm (82.7 inches)
Total Width
Ground Clearance
Wheelbase1,440 mm (56.7 inches)
Dry Weight
Wet Weight177.0 kg (390.2 pounds)
Wheels & Brakes
Front Tire/Tyre120/60-ZR17
Rear Tire/Tyre160/60-ZR17
Front BrakesDouble disc
Front Brake Diameter320 mm (12.6 inches)
Rear BrakesSingle disc
Rear Brake Diameter245 mm (9.6 inches)
Wheels
Comments
The 620 is the perfect entry to the Monster family. Easy to maintain, it is the lightest and easiest handling Ducati. The motorcycle of choice for the official Ducati riding courses, the 620 offers a low seat height, a new slipper clutch for seamless shifting, a new, colour-matched front fairing, newly designed mirrors for increased visibility, and a comfortable, upright riding position.