These are the known mechanical and performance specifications for your 2008 Honda CRF 450 R.
Basic Specs

Engine
Displacement449.00 ccm (27.40 cubic inches)
Type
DetailsSingle cylinder, four-stroke
Max RPM
Compression12.0:1
Bore/Stroke96.0 x 62.1 mm (3.8 x 2.4 inches)
Valves/Cylinder
FuelingCarburettor. 41.0mm Keihin® flat-slide
IgnitionCD
Exhaust
Lubrication
CoolingLiquid
Fuel Economy & Polution
Fuel Consumption
Fuel Capacity7.19 litres (1.90 gallons)
Emissions
Chassis
Frame Type
Rake26.8°
Trail111 mm (4.4 inches)
Front Suspension47.0mm inverted Showa®
Front Travel406 mm (16.0 inches)
Rear SuspensionPro-Link®
Rear Travel330 mm (13.0 inches)
Seat
Seat Height955 mm (37.6 inches) If adjustable, lowest setting.
Alt. Seat Height
Total Height
Total Length
Total Width
Ground Clearance340 mm (13.4 inches)
Wheelbase1,488 mm (58.6 inches)
Dry Weight108.0 kg (238.0 pounds)
Wet Weight
Wheels & Brakes
Front Tire/Tyre80/0-21
Rear Tire/Tyre100/90-19
Front BrakesSingle disc
Front Brake Diameter
Rear BrakesSingle disc
Rear Brake Diameter
Wheels
Comments
Model ID: CRF450R