These are the known mechanical and performance specifications for your 1990 Gilera RC 600.
Basic Specs

Engine
Displacement554.00 ccm (33.81 cubic inches)
Type
DetailsSingle cylinder, four-stroke
Max RPM
Compression10.5:1
Bore/Stroke98.0 x 74.0 mm (3.9 x 2.9 inches)
Valves/Cylinder4
Fueling
Ignition
Exhaust
Lubrication
CoolingLiquid
Performance
Horespower48.00 HP (35.0 kW)
Torque
Top Speed145.0 km/h (90.1 mph)
Fuel Economy & Polution
Fuel Consumption
Fuel Capacity12.00 litres (3.17 gallons)
Emissions
Chassis
Frame Type
Rake
Trail
Front Suspension
Front Travel
Rear Suspension
Rear Travel
Seat
Seat Height
Alt. Seat Height
Total Height
Total Length
Total Width
Ground Clearance
Wheelbase
Dry Weight
Wet Weight171.0 kg (377.0 pounds)
Wheels & Brakes
Front Tire/Tyre90/90-21
Rear Tire/Tyre140/80-17
Front BrakesSingle disc
Front Brake Diameter
Rear BrakesSingle disc
Rear Brake Diameter
Wheels
Comments