These are the known mechanical and performance specifications for your 2011 GAS GAS EC 250 2T.
Basic Specs

Engine
Displacement249.30 ccm (15.21 cubic inches)
Type
DetailsSingle cylinder, two-stroke
Max RPM
Compression
Bore/Stroke66.4 x 72.0 mm (2.6 x 2.8 inches)
Valves/Cylinder
FuelingCarburettor. Keihin 38 mm - Intake by reed valve
Ignition
Exhaust
Lubrication2% mixture.
CoolingLiquid
Fuel Economy & Polution
Fuel Consumption
Fuel Capacity9.50 litres (2.51 gallons)
Emissions
Chassis
Frame TypeChrom-Molybdenum tubular frame
Rake
Trail
Front SuspensionSachs 48 mm Up-Side-Down
Front Travel295 mm (11.6 inches)
Rear SuspensionSachs hydraulic mono shock absorber
Rear Travel310 mm (12.2 inches)
Seat
Seat Height945 mm (37.2 inches) If adjustable, lowest setting.
Alt. Seat Height
Total Height
Total Length2,200 mm (86.6 inches)
Total Width
Ground Clearance
Wheelbase1,476 mm (58.1 inches)
Dry Weight101.0 kg (222.7 pounds)
Wet Weight
Wheels & Brakes
Front Tire/Tyre90/90-21
Rear Tire/Tyre140/80-18
Front BrakesSingle disc. Wave floating, 2-piston caliper
Front Brake Diameter260 mm (10.2 inches)
Rear BrakesSingle disc. Wave disc, 1-piston caliper
Rear Brake Diameter220 mm (8.7 inches)
WheelsLight aluminium spoke rim
Comments
Bike made in Spain.