These are the known mechanical and performance specifications for your 2011 Derbi Mulhacen 659.
Basic Specs

Engine
Displacement659.70 ccm (40.25 cubic inches)
Type
DetailsSingle cylinder, four-stroke
Max RPM
Compression10.0:1
Bore/Stroke100.0 x 84.0 mm (3.9 x 3.3 inches)
Valves/Cylinder4
FuelingInjection. Nippondenso electronic injection with second air system,44mm throttle valve.
IgnitionElectronic CDI
Exhaust
LubricationDry sump
CoolingLiquid
Drivetrain
Gearbox5-speed
Final Drive
ClutchMulti-plate
DrivelineGear assembly primary, chain final
Fuel Economy & Polution
Fuel Consumption
Fuel Capacity13.00 litres (3.43 gallons)
Emissions
Chassis
Frame Type
Rake
Trail
Front SuspensionUpside-down fork.
Front Travel120 mm (4.7 inches)
Rear SuspensionHydraulic progressive linkage monoshock.
Rear Travel120 mm (4.7 inches)
Seat
Seat Height810 mm (31.9 inches) If adjustable, lowest setting.
Alt. Seat Height
Total Height
Total Length2,120 mm (83.5 inches)
Total Width
Ground Clearance
Wheelbase1,386 mm (54.6 inches)
Dry Weight165.0 kg (363.8 pounds)
Wet Weight
Wheels & Brakes
Front Tire/Tyre110/80-18
Rear Tire/Tyre150/70-18
Front BrakesSingle disc. Radial mounted caliper
Front Brake Diameter320 mm (12.6 inches)
Rear BrakesSingle disc
Rear Brake Diameter245 mm (9.6 inches)
Wheels
Comments
Spanish made bike.