Honda CRF450R

Honda CRF450F
Manufacturer Honda Motor Company
Class Motocross
Engine Single-cylinder, SOHC, Multivalve, water-cooled, four-stroke

The Honda CRF450F is a four-stroke racing motorcross bike built by Honda Motor Company. It is the successor to the Honda XR, which was discontinued in 2002.

The Honda CRF450X is the enduro version of the Honda CRF450F

Notable changes

2004 7/8" Handlebars
2008 Honda Progressive Steering Damper
2009 Fuel injection
2013 Air forks, dual exhaust

First generation: 2002-2004

First Generation CRF450F
Production 2002-2004
Predecessor Honda XR series
Successor Second Generation CRF405F
Engine 449 cc liquid-cooled single-cylinder SOHC four-stroke, 96mm x 62.1mm, 11.5:1 compression
Transmission 5-speed
Suspension

Front: 305mm travel

Rear: 315mm travel
Brakes Single disc, 240mm
Wheelbase 59.4 in
Seat height 28.6 in
Weight 224.9 lbs (dry)
Fuel capacity 2.4 gals

The CRF450R was introduced in 2002. Unlike the competing Yamaha YZ426, the first generation CRF450R has an aluminum frame. In 2003, Honda added a longer shock and new linkage to raise the rear end and steepen the head angle. In 2003, camshaft, exhaust, and ignition map were revised. The handlebar size was changed to 78 in (22 mm) in 2004.

Second generation: 2005-2008

Second Generation CRF450F
Production 2005-2008
Predecessor First Generation CRF405F
Successor Third Generation CRF405F
Engine 449 cc liquid-cooled single-cylinder SOHC four-stroke, 96mm x 62.1mm, 12.0:1 compression
Transmission Close-ratio five-speed
Suspension

Front: 47mm inverted Showa cartridge fork with rebound and compression damping adjustability; 12.4 inches travel

Rear: Pro-Link Showa single shock with spring preload, rebound damping adjustability, and high/low-speed compression damping adjustability; 12.5 inches travel
Brakes

Front: Single 240mm disc with twin-piston caliper

Rear: Single 240mm disc
Tires

Front: 80/100-21

Rear: 110/90-19
Rake, trail 26.79°, 109.4mm
Wheelbase 58.7 in
Seat height 37.6 in
Weight 218.5 lbs (claimed)[1] (dry)
Fuel capacity 1.9 gals

The second generation CRF450R had a redesigned motor and frame with new bodywork styling from the new CRF250R. In 2008, the Honda Progressive Steering Damper (HPSD) was introduced, allowing the steering geometry to be more aggressive.

Third generation: 2009-2012

Third Generation CRF450F
Production 2005-2008
Predecessor Second Generation CRF405F
Successor Third Generation CRF450F
Engine 449 cc liquid-cooled single-cylinder SOHC four-stroke, 96mm x 62.1mm, 12.0:1 compression
Transmission Close-ratio five-speed
Suspension

Front: 48mm inverted KYB Air-Oil-Separate (AOS) with rebound and compression damping adjustability; 12.2 inches travel

Rear: Pro-Link KYB single shock with spring preload, rebound damping adjustability, and high/low-speed compression damping adjustment; 12.6 inches travel
Brakes

Front: Single 240mm disc with twin-piston caliper

Rear: Single 240mm disc
Tires

Front: 80/100-21

Rear: 120/80-19
Rake, trail 26° 52', 114.2mm
Wheelbase 58.7 in
Seat height 37.6 in
Weight 234.8 lbs (claimed)[2] (wet)
Fuel capacity 1.5 gal

The third generation CRF450R had fuel-injection and an all-new bike to match.

Fourth generation: 2013-present

Fourth Generation CRF450F
Production 2013–
Predecessor Third Generation CRF450F
Engine 449 cc liquid-cooled single-cylinder SOHC four-stroke, 96mm x 62.1mm, 12.5:1 compression
Transmission Close-ratio five-speed
Suspension

Front: 48mm inverted KYB PSF® (Pneumatic Spring Fork) with rebound and compression-damping adjustability. 12.2 inches travel.

Rear: Pro-Link® KYB single shock with adjustable spring preload, rebound damping adjustability, and high/low-speed compression damping adjustment. 12.4 inches travel
Brakes

Front: Single 240mm disc with twin-piston caliper

Rear: Single 240mm disc
Tires

Front: Dunlop MX51FA 80/100-21

Rear: Dunlop MX51 120/80-19
Rake, trail 27° 04', 116mm
Wheelbase 58.7 in
Seat height 37.5 in
Weight 242.7 lbs (claimed)[3] (wet)
Fuel capacity 1.66 gal

The fourth and present generation of the CRF450R introduced a new twin-exhaust to centralize mass. Also new to the fourth generation were air forks.

See also

References

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