These are the known mechanical and performance specifications for your 2008 Dayun DY 125-8B.
Basic Specs

Engine
Displacement125.00 ccm (7.63 cubic inches)
Type
DetailsSingle cylinder, four-stroke
Max RPM
Compression
Bore/Stroke
Valves/Cylinder
FuelingCarburettor
Ignition
Exhaust
Lubrication
CoolingAir
Performance
Horespower6.90 HP (5.0 kW)
Torque
Top Speed90.0 km/h (55.9 mph)
Chassis
Frame Type
Rake
Trail
Front Suspension
Front Travel
Rear Suspension
Rear Travel
Seat
Seat Height
Alt. Seat Height
Total Height1,080 mm (42.5 inches)
Total Length2,010 mm (79.1 inches)
Total Width740 mm (29.1 inches)
Ground Clearance
Wheelbase
Dry Weight127.0 kg (280.0 pounds)
Wet Weight
Wheels & Brakes
Front Tire/Tyre
Rear Tire/Tyre
Front Brakes
Front Brake Diameter
Rear Brakes
Rear Brake Diameter
Wheels
Comments
Chinese made bike.