Honda unveils 2022 CRF450RXJune 9, 2021
The CRF450RX, like its sibling, the Honda CRF450R motocross motorcycle, has received a number of enhancements, including a reconfigured electronic engine control unit and re-calibrated shock absorbers. The frame remains the same, and like the 2022 CRF450R, it is the exact same frame as the CRF450RW that Tim Geiser piloted at the 2019 and 2020 Motocross World Championships (MXGP).
For the 2017 model year, Honda has introduced an all-new, race-ready motocross bike – the CRF450RX. It is based on the 2017 model year CRF450R engine and chassis, a completely revamped, first in eight years, Honda motocross motorcycle with a 450cc engine. However, the CRF450RX has received a number of improvements made exclusively for it, in particular, a larger fuel tank, an 18-inch rear wheel, an updated PGM-FI fuel injection control map and suspension changes.
The CRF450R was the ideal platform – it gave the CRF450RX the motocross DNA to tackle any stage of enduro, as well as the ability to confidently tackle flat trails, difficult climbs and narrow, challenging road sections. Just as important to the owner, the CRF450RX is the same high quality, reliable Honda product built to last.
For the 2021 model year, the CRF450RX has evolved significantly, again alongside its fellow CRF450R. Both bikes have received many updates based on the development of the CRF450RW, which won the 2019 World Motocross Championship.
Now, the 2022 model year has a re-tuned ECU and updated suspension that make the CRF450RX even more competitive off-road.
The bike features an updated ECM and re-tuned Showa front and rear shock absorbers for improved damping performance. The 2022 CRF450RX chassis remains the same with the exception of Showa front and rear suspension enhancements. The goal of the next motorcycle update was to significantly improve “lag” – to increase the damping height of the piston stroke both front and rear, optimizing the balance between the front and rear.
Compared to the motocross model, the CRF450RX is designed to operate in a much wider range of conditions, so it has special suspension settings. The Showa USD AG2 49mm coil spring forks uses a “factory” block supplied to Japan Championship motocross racing teams. With the 2021 model year update, fork travel has been increased by 5mm to 310mm and the front axle strength has been increased.
On the 2022 motorcycle, a set of low speed washers have been modified in the shock absorber piston to provide tighter compression and rebound damping settings. The volume of oil has decreased by 8 cubic meters. cm up to 380 cc cm.
The Showa MKE AF2 rear shock piston valve washer set of low, medium and high speed piston washers provide a tighter overall compression damping setting. The number of return adjustment positions has been increased from 10 to 13, the number of positions for low speed compression has been reduced from 9 to 7. The settings for high speed compression are now 2-1 / 3 (formerly 2-1 / 6). The preset spring length is from 6.1mm / 305N to 6.5mm / 325N. The volume of oil increased by 1 cubic meter. cm to 422 cc cm.
Thanks to the evolutionary leap that the 2021 model year made, the components and ergonomics of the motorcycle have been significantly improved. Narrower side members reduced the main frame weight by 700 grams, while the redesigned subframe saved an additional 320 grams. While maintaining torsional rigidity, the longitudinal frame rigidity has been reduced by 20%, which improves traction and improves cornering speed and steering precision. New, more flexible upper and lower crossheads have been installed to increase steering speed. The Pro-Link aluminum swingarm has been rebalanced to match the frame.
The seating position is improved by installing a shorter, lighter and 10 mm lower seat at the rear of the seat, which is now also easier to install and remove. The number of 8mm bolts holding the plastic to the frame has been reduced to 4, making maintenance more convenient.
The radiator covers with air duct are made from a single piece of plastic. These parts were designed using computational fluid dynamics to allow as much air as possible to pass through them. The plastic fuel tank holds 8 liters of fuel.
The standard, lightweight and flexible Rental Fatbar provides optimum comfort. The upper crosshead has two attachment points for the handlebar, allowing it to move up and down within 26mm. When the holder is rotated 180 °, the handlebar can be moved an additional 10 mm from the base position, resulting in four unique seating options.
The front brakes use a dual-piston caliper with 30mm and 27mm diameters, respectively, and a 260mm wave-pattern brake disc, which, together with a low expansion brake hose, provides reliability and high efficiency. The rear brakes feature a single-piston caliper and a wave-patterned 240mm disc.
DID aluminum rims are painted black. The front disc is 21x; 1.6 “, the rear is 18x; 2.15”. For the 2021 model year, the rear wheel is stronger and lighter. The AT81 Geomax tires have been developed by Dunlop specifically for enduros with a 90 / 90-21 front and a 120 / 90-18 rear. The vibrant red is a striking addition to the aggressive lines of the 2022 CRF450RX.
The 2022 CRF450RX is powered by the previous 449.7cc Unicam four-valve engine with a new ECU to further improve responsiveness when engine speed is in the low to mid range.
The changes made to the 2021 model year engine were significant. The increased peak power achieved at speeds in excess of 5000 rpm and the increased torque at low revs are the result of an increase in air filter volume by 1.8 liters (to 4.1 liters). The angle of inclination of the nozzle has also been increased from 30 to 60 degrees. The new tilt of the nozzle towards the opposite direction to the air entering the engine improved intake efficiency, cooling of the atomized fuel and increased the sensitivity of the “throttle” control. The decompression system is also new: its counterweight has moved from the right side of the camshaft to the left, which provides more stable operation at low rpms and reduces the likelihood that the engine can “stall” while driving.
The biggest change for the 2021 model year was the two exhaust ports of the engine: instead of round, they were oval like the CBR1000RR-R Fireblade, which increased the efficiency of the powertrain. The exhaust pipe, which became a single, was moved closer to the center line of the motorcycle. Two resonators were installed on the tube, which, with increased power, provided noise reduction.
The model is equipped with an 8-disc hydraulic clutch, the same as on Tim Geiser’s champion bike. It provides excellent control and sensitivity of the lever and maintains a constant gap between the lever and the handle in difficult driving conditions. In addition, this clutch reduces slippage by 85% when the engine develops peak power.
The cylinder diameter is 96 mm. The piston stroke is 62.1 mm. The compression ratio is 13.5: 1. The sensor that determines which transmission gear is engaged, allows you to use three different ignition maps for 1st and 2nd, 3rd and 4th and 5th gears.
The CRF450RX torque control system prevents the rear wheel from spinning for maximum traction. The system does not use a wheel speed sensor and retains the critical feel of throttle control when throttle; the ignition timing becomes later and the PGM-FI fuel injection system is corrected when the engine speed changes above the set value.
Three modes of rear wheel drive control are designed for different driving conditions:
Mode 1 controls traction the weakest, with the longest pause – suitable for reducing wheel slip and maintaining control in tight corners.
In Mode 3, the system is faster and stronger, so it is best suited for driving on mud and slippery surfaces.
Mode 2 is a cross between modes 1 and 3 in terms of reaction speed and the strength of the system’s intervention in controlling the traction of the drive wheel.
The Launch Control indicator, EFI warning, HSTC and EMSB mode selection buttons and LED display are located on the left side of the steering wheel. Pressing and holding the HSTC button for 0.5 seconds toggles modes. In this case, the green LED blinks once if mode 1 is on, twice if mode 2 is activated, and three times for mode 3.
The HSTC system can also be turned off completely. When the engine is on, the system uses the last selected setting.
The Launch Control System provides riders of all skill levels with the best option for a strong start. The system has 3 modes:
Level 3 – 8,250 RPM Dirt / Beginner.
Level 2 – 8,500 rpm dry / standard.
Level 1 – 9,500 rpm dry / expert.
Activating the launch control system is simple: to activate it, you need to squeeze the clutch lever and press the “Start” button located on the right. After that, the LED will flash once, which means that level 1 is selected. Press the Start button again for 0.5 seconds or longer, and the LED indicator will flash twice, indicating that level 2 has been activated. Repeat the process and the LED indicator will flash. 3 times, indicating that level 3 is selected.
The Engine Mode Select (EMSB) button changes the engine performance and activates three modes, depending on the riding conditions or rider preference:
Mode 1 – Standard.
Mode 2 – Smooth.
Mode 3 – Aggressive.
The HRC Setting tool can provide an engine block control circuit for less experienced riders, providing much easier and smoother motorcycle handling, with smoother throttle response. The tool also allows for aggressive mode with hypersensitive throttle and engine response while racing.
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