Honda CRF450R

Honda CRF450R

Manufacturer	Honda Motor Company
Class	Motocross
Engine	SOHC, multivalve, water-cooled, four-stroke, single

The Honda CRF450R is a four-stroke racing motocross motorcycle built by Honda Motor Company. It is the successor to the Honda CR250R two-stroke.

The Honda CRF450X is the enduro version of the Honda CRF450R.

Notable changes

2004	7/8" Handlebars
2008	Honda Progressive Steering Damper
2009	Fuel injection
2013	Air forks, dual exhaust
2017	Spring forks, no more Progressive Steering Damper
2018	Electric starter
2021	Single exhaust

First generation: 2002–2004

First Generation CRF450R

Production	2002–2004
Predecessor	Honda CR series
Successor	Second Generation CRF450R
Engine	449 cc (27.4 cu in) liquid-cooled, SOHC four-stroke, single
Bore / stroke	96 mm × 62.1 mm (3.78 in × 2.44 in)
Compression ratio	11.5:1
Transmission	5-speed manual
Suspension	Front: 305mm travel Rear: 315mm travel
Brakes	Single disc, 240 mm (9.4 in)
Wheelbase	59.4 in (1,510 mm)
Seat height	28.6 in (730 mm)
Weight	224.9 lb (102.0 kg)[ citation needed ] (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 7⁄8 in (22 mm) in 2004.

Second generation: 2005–2008

Second Generation CRF450R

Production	2005–2008
Predecessor	First Generation CRF450R
Successor	Third Generation CRF450R
Engine	449 cc (27.4 cu in) liquid-cooled, SOHC, four-stroke, single
Bore / stroke	96 mm × 62.1 mm (3.78 in × 2.44 in)
Compression ratio	12.0:1
Transmission	Close-ratio five-speed manual
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 240 mm (9.4 in) 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 (1,490 mm)
Seat height	37.6 in (960 mm)
Weight	218.5 lb (99.1 kg) (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 CRF450R

Production	2009–2012
Predecessor	Second Generation CRF450R
Successor	Fourth Generation CRF450R
Engine	449 cc (27.4 cu in), liquid-cooled, SOHC, four-stroke, single
Bore / stroke	96 mm × 62.1 mm (3.78 in × 2.44 in)
Transmission	Close-ratio five-speed manual
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 240 mm (9.4 in) 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 (960 mm)
Weight	234.8 lb (106.5 kg) (claimed) [2]  (wet)
Fuel capacity	1.5 gal

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

Fourth generation: 2013–2016

Fourth Generation CRF450R

Production	2013–2016
Predecessor	Third Generation CRF450R
Engine	449 cc (27.4 cu in) liquid-cooled, SOHC four-stroke, single
Bore / stroke	96 mm × 62.1 mm (3.78 in × 2.44 in)
Compression ratio	12.5:1
Transmission	Close-ratio five-speed manual
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 240 mm (9.4 in) 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 (1,490 mm)
Seat height	37.5 in (950 mm)
Weight	242.7 lb (110.1 kg) (claimed) [3]  (wet)
Fuel capacity	1.66 gal

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

Fifth generation: 2017–2020

The 2017 CRF450R offers a new engine design and optional electric start. The air forks were switched out in favor of Showa coil spring forks.

The 2018 offers standard electric start and new engine mount offer most chassis flex.

The 2019 CRF450R features an all-new swing-arm and a launch control setting.

Sixth generation: 2021–present

New slimmer frame and plastic design, single exhaust ported through center of the upright. The exhaust port is now oval instead of round.

See also

• Honda CRF series

References

1. 2005 Honda CRF450R Specifications - Honda.com
2. 2009 Honda CRF450R - Specifications - Honda.com
3. 2013 Honda CRF450R - Specifications - Honda.com