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Honda CRF450R

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Honda CRF450R
ManufacturerHonda Motor Company
ClassMotocross
EngineSOHC, 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

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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

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First Generation CRF450R
Production2002–2004
PredecessorHonda CR series
SuccessorSecond Generation CRF450R
Engine449 cc (27.4 cu in) liquid-cooled, SOHC four-stroke, single
Bore / stroke96 mm × 62.1 mm (3.78 in × 2.44 in)
Compression ratio11.5:1
Transmission5-speed manual
SuspensionFront: 305mm travel
Rear: 315mm travel
BrakesSingle disc, 240 mm (9.4 in)
Wheelbase59.4 in (1,510 mm)
Seat height28.6 in (730 mm)
Weight224.9 lb (102.0 kg)[citation needed] (dry)
Fuel capacity2.4 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

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Second Generation CRF450R
Production2005–2008
PredecessorFirst Generation CRF450R
SuccessorThird Generation CRF450R
Engine449 cc (27.4 cu in) liquid-cooled, SOHC, four-stroke, single
Bore / stroke96 mm × 62.1 mm (3.78 in × 2.44 in)
Compression ratio12.0:1
TransmissionClose-ratio five-speed manual
SuspensionFront: 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
BrakesFront: Single 240 mm (9.4 in) disc with twin-piston caliper Rear: Single 240mm disc
TiresFront: 80/100-21 Rear: 110/90-19
Rake, trail26.79°, 109.4mm
Wheelbase58.7 in (1,490 mm)
Seat height37.6 in (960 mm)
Weight218.5 lb (99.1 kg) (claimed)[1] (dry)
Fuel capacity1.9 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

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Third Generation CRF450R
Production2009–2012
PredecessorSecond Generation CRF450R
SuccessorFourth Generation CRF450R
Engine449 cc (27.4 cu in), liquid-cooled, SOHC, four-stroke, single
Bore / stroke96 mm × 62.1 mm (3.78 in × 2.44 in)
TransmissionClose-ratio five-speed manual
SuspensionFront: 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
BrakesFront: Single 240 mm (9.4 in) disc with twin-piston caliper Rear: Single 240mm disc
TiresFront: 80/100-21 Rear: 120/80-19
Rake, trail26° 52', 114.2mm
Wheelbase58.7 in
Seat height37.6 in (960 mm)
Weight234.8 lb (106.5 kg) (claimed)[2] (wet)
Fuel capacity1.5 gal

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

Fourth generation: 2013–2016

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Fourth Generation CRF450R
Production2013–2016
PredecessorThird Generation CRF450R
Engine449 cc (27.4 cu in) liquid-cooled, SOHC four-stroke, single
Bore / stroke96 mm × 62.1 mm (3.78 in × 2.44 in)
Compression ratio12.5:1
TransmissionClose-ratio five-speed manual
SuspensionFront: 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
BrakesFront: Single 240 mm (9.4 in) disc with twin-piston caliper Rear: Single 240mm disc
TiresFront: Dunlop MX51FA 80/100-21 Rear: Dunlop MX51 120/80-19
Rake, trail27° 04', 116mm
Wheelbase58.7 in (1,490 mm)
Seat height37.5 in (950 mm)
Weight242.7 lb (110.1 kg) (claimed)[3] (wet)
Fuel capacity1.66 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

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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

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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

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References

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