Honda CRF450R

After today showcasing the new 2021 CRF450R (Link) we thought it a great opportunity for a ride back in time with this short history of the CRF450R since its inception in 2002.

2002-2004

The lightest four-stroke motocrosser of its day, the original CRF450R set the stage for years of class-leading performance. Highlighted by Honda’s all-new Unicam engine and an aluminium twin-spar frame, the 2002 model’s early success was due not only to its outright performance, but also to the friendly characteristics that aided riders’ transition from two-strokes. The model made headlines for its plush, well-controlled Showa suspension, establishing from the very beginning a reputation for controllable, agile handling.

• Unicam engine
• Aluminium twin-spar frame
• Lightest production four-stroke MX bike

There were minor changes in both of the following two years, the most noteworthy being the move to a longer shock that sharpened the handling even further in 2003.

2005-2008

The second generation CRF450R had big shoes to fill, and it managed the challenge exceptionally. Centred on a heavily updated engine, the 2005 model impressed with improved top-end power and wider power band. An updated design enhanced the overall look, while subtle revisions to the frame altered the bike’s flex characteristics, enhancing the plush feel for which the first generation had already been well known.

• Reduced weight
• New frame with revised flex characteristics
• Wider powerband
• HPSD steering damper introduced in 2008

Maintenance intervals for valve adjustments were widened in 2005 thanks to new valve seat material, while 2008 saw the introduction of the HPSD steering damper. Additional changes for 2008 included geometry revisions, clutch updates and a rev-limit increase that combined to further solidify the model’s reputation as a benchmark in its class.

2009-2012

For 2009, Honda engineers challenged themselves to create a CRF450R that was lighter than its predecessor despite adding electronic fuel injection. The result of their efforts was the third-generation CRF450R. Benefitting from an extreme focus on weight reduction and mass centralisation, this all-new model was highlighted by a new twin-spar aluminium frame with multiple design changes, including a repositioned steering head, lower overall height and reworked geometry. These changes combined with an all-new, more compact engine to create a bike that was known both its agile handling and strong responsiveness off the bottom.

• New, more compact engine
• Fuel injection
• New frame with revised geometry
• KYB AOS fork

2013-2016

With an all-new frame and updated engine, the 2013 CRF450R had a design brief that was focused on improved cornering performance. The result of the redesign was great turn-in performance and more consistent steering through corners. A milestone model for Honda, the 2013 was recognised for its dual-muffler exhaust, new styling and KYB Pneumatic Spring Fork (PSF), which used air pressure to provide spring resistance in place of coil springs.

• New frame and swingarm
• New bodywork
• KYB PSF fork
• Dual-muffler exhaust

2016 saw Tim Gajser win the MXGP world title for the first time, becoming the youngest MXGP champion ever, at the age of 20.

2017-2020

The design brief of the 2017 CRF450R followed Honda’s new ‘Absolute Holeshot’ ethos. An all-new engine featured a downdraft intake, new compression chamber and finger rocker arm, among other changes aimed at increasing efficiency. A lighter, sixth generation twin-spar aluminium frame was designed with improved traction in mind, featuring a reduction in torsional rigidity. The 2019 model marked a return to coil-spring front suspension; other key changes included a new lighter titanium fuel tank and updated plastics with in-mould graphics.

• Introduction of ‘Absolute Holeshot’ philosophy
• New engine with focus on improved acceleration / power
• Sixth-generation twin-spar aluminium frame
• 49mm coil-spring Show fork

The CRF450R’s major overhaul was followed up by minor changes in 2018, including updates to the suspension and mapping. In 2019, Honda once again made revisions to the frame, swingarm and shock linkage. Launch control and black D.I.D wheels were added. For the 2020 year model, Honda added Honda Selectable Torque Control (HSTC) to the package.

In professional racing, Team HRC’s Tim Gajser earned his second MXGP World Championship in 2019.

2021 CRF450R

• Narrower main spars and new rear sub-frame save weight, drawing on HRC knowhow
• Narrower swing-arm spars and swing-arm pivot point, with revised swingarm rigidity balance
• Geometry changes combine with the above to improve cornering ability
• Re-valved front suspension with an extra 5 mm stroke matched with re-valved rear shock
• Improved ergonomics from smaller new seat, and more compact, redesigned plastics
• Larger airbox plus revised throttle body and exhaust ports for bottom-end drive
• New exhaust downpipe with single muffler boosts torque and saves weight
• Hydraulic clutch replaces cable operation for consistent and light lever feel
• Revised decompressor system gives improved stall resistance
• Honda Selectable Torque Control (HSTC) with 3 riding modes, plus OFF
• HRC Launch Control offers 3 start options
• Engine Mode Select Button (EMSB) features 3 maps to adjust output character
• HSTC button now rationalised into the left-hand switchgear
• HRC setting tool updated for changes to Aggressive and Smooth modes
• New triple clamp design
• Revised air cleaner system
• Revised fuel pump
• New decompression weight design
• New graphics
• Due October 2020

Source: MCNews.com.au