These are the known mechanical and performance specifications for your 2012 Yamaha DSC4 DragStar Classic Four.
Basic Specs

Engine
Displacement399.00 ccm (24.35 cubic inches)
Type
DetailsV2, four-stroke
Max RPM
Compression9.7:1
Bore/Stroke68.0 x 55.0 mm (2.7 x 2.2 inches)
Valves/Cylinder2
FuelingInjection
IgnitionTCI
Exhaust
LubricationWet sump
CoolingAir
Drivetrain
Gearbox5-speed
Final DriveShaft drive (cardan)
ClutchWet multiple
DrivelineConstant mesh
Performance
Horespower30.00 HP (21.9 kW)
Torque31.00 Nm (3.2 kgf-m or 22.9 ft.lbs)
Top Speed
Fuel Economy & Polution
Fuel Consumption2.70 litres/100 km (37.0 km/l or 87.12 mpg)
Fuel Capacity15.00 litres (3.96 gallons)
Emissions62.6 CO2 g/km. (CO2 - Carbon dioxide emission)
Chassis
Frame TypeDouble cradle
Rake35.0°
Trail145 mm (5.7 inches)
Front SuspensionTelescopic
Front Travel
Rear SuspensionSwing arm
Rear Travel
SeatTwo person seat
Seat Height710 mm (28.0 inches) If adjustable, lowest setting.
Alt. Seat Height
Total Height1,100 mm (43.3 inches)
Total Length2,450 mm (96.5 inches)
Total Width930 mm (36.6 inches)
Ground Clearance145 mm (5.7 inches)
Wheelbase1,625 mm (64.0 inches)
Dry Weight
Wet Weight247.0 kg (544.5 pounds)
Wheels & Brakes
Front Tire/Tyre130/90-16
Rear Tire/Tyre170/80-15
Front BrakesSingle disc
Front Brake Diameter
Rear BrakesExpanding brake (drum brake)
Rear Brake Diameter
Wheels
Comments
Sold in Japan.