2020 Honda CRF250RX Features And Benefits

Chaparral Motorsports
|
May 7, 2019
Today Honda announced information and specs regarding the 2020 CRF 250RX. Campaigned in national championship off-road racing by JCR Honda's Preston Campbell, SLR Honda's Tallon LaFountaine and Phoenix Racing Honda's Austin Lee, the CRF250RX features closed-course off-road specific components like a large fuel tank, aluminum sidestand, and 18-inch rear wheel, and for 2020, it receives a host of important updates, including engine enhancements aimed at bettering low-to-midrange power, and chassis revisions that improve handling. To increase torque and improve driveability, the cam profile is new, the combustion chamber is reshaped, and the exhaust resonator has been removed. At the same time, maneuverability has been improved through a lighter frame and swingarm with optimized flex characteristics, along with a lower battery position and internal suspension updates.



2020 Updates

[caption id="attachment_72871" align="aligncenter" width="300"] 2020 Honda CRF250RX[/caption]

  • New cam profile delays opening of exhaust valves and has reduced valve overlap, resulting in improved torque and power in the 6,000-10,000 rpm range.
  • Optimized combustion-chamber shape.
  • Ignition timing is optimized at 8,000 rpm for improved torque and power.
  • Gear-position sensor added to allow dedicated ignition maps for each gear.
  • Header-pipe resonator is removed for improved power character when shifting from second to third gear.
  • Muffler is revised for improved low-to-midrange torque.
  • New air-filter element is 10% larger for increased airflow.
  • Enlarged left-side radiator for efficient cooling with higher engine-power output.
  • Second gear has revised (higher) ratio for improved drive, while second and third gears have a new WPC surface treatment for improved durability and reduced friction.
  • Clutch capacity is increased by 18%, and clutch spring has a higher rate.
  • New lighter aluminum perimeter frame and aluminum swingarm are designed to achieve increased yaw-angle stiffness while retaining lateral and torsional stiffness, resulting in improved handling.
  • Newly shaped footpegs are 20% lighter and shed mud more easily, giving the rider great feel and confidence in all riding conditions.
  • Thanks in part to revised internal suspension settings (fork has increased low-speed damping, while shock has increased low-speed compression and reduced high-speed compression), handling has been improved in the following areas: tracking, turning and traction.
  • Battery repositioned 28mm lower to drop center of gravity for better handling.
  • Rear brake has a shorter hose and longer, lighter pedal, as well as a new pad material with improved power and better durability in muddy conditions. Lower-rear brake guard removed for reduced unsprung weight and improved cooling.
  • New graphics.

Engine/Drivetrain

  • High-performance, DOHC, 249cc single-cylinder engine with dual-overhead-cam design and high rev limit, offering great performance.
  • Finger rocker arms with Diamond Like Coating (DLC) maximize valve lift while retaining a low engine height.
  • Downdraft intake layout produces strong power and enables great throttle response by reducing resistance, thereby improving air-charging efficiency.
  • 44mm throttle body provides ideal low-rpm intake airflow for strong corner-exit performance.
  • Piston oil jet uses five nozzle holes for efficient piston-cooling efficiency and minimized knocking, enabling a precise ignition-timing setting for optimum power delivery.
  • Advanced AC generator reduces weight and friction losses.
  • Electric-start standard for easy, fast engine startup.
  • Easily selectable Standard, Smooth, and Aggressive riding modes enable simple tuning depending on rider preference or course conditions.
  • Selectable HRC launch control provides a steady stream of torque for excellent performance on race starts.

Chassis/Suspension

  • 2.2 gallon resin fuel tank for completing long closed-course off-road loops.
  • 18-inch rear wheel to enable taller tire sidewalls for improved traction in technical conditions.
  • Forged aluminum side stand is designed to be lightweight yet strong.
  • Sealed drive chain to withstand the elements.
  • Suspension with settings dedicated to closed-course off-road use.
  • Low center of gravity reduces front-end lift for strong acceleration performance.
  • Lightweight front-brake caliper uses pistons of different diameters (30mm and 27mm) for strong braking performance.
  • Front brake hose resists expansion for precise braking.
  • Renthal® Fatbar® reduces weight of the steering system, and flexes for optimal comfort.
  • Top triple clamp features two handlebar-holder locations for moving the handlebar rearward and forward by 26mm, ensuring rider comfort. When holder is turned 180 degrees, the handlebar can be moved an additional 10mm from the base position, resulting in four total unique riding positions.
  • Black rims deliver a strong presence on and off the track.
  • Smooth bodywork layout eases rider movement.
  • In-mold graphics are durable and resistant to peeling caused by washing or abrasion.
  • Dunlop Geomax AT81 tires provide optimum feel and traction in challenging riding conditions.








































































































































  • Model CRF250RX
    ENGINE  
    Type 249cc liquid-cooled single-cylinder four-stroke
    Valve Train DOHC, four-valve; 33mm intake, titanium; 26mm exhaust, titanium
    Bore x Stroke 79.0mm x 50.9mm
    Compression Ratio 13.9:1
    Induction Programmed fuel-injection system (PGM-FI); 44mm throttle bore
    Ignition Full transistorized
    Starter Push-button electric starter
    Transmission Constant-mesh 5-speed return; manual
    Clutch Multiplate wet (6 springs)
    Final Drive #520 sealed chain; 13T/48T
    SUSPENSION  
     

    Front     		49mm fully adjustable leading-axle inverted telescopic Showa coil-spring fork w/ 12.0 in. travel
    Rear Pro-Link system; fully adjustable Showa single shock w/ 12.4 in. wheel travel
    BRAKES  
    Front 2-piston caliper (30mm, 27mm) hydraulic; single 260mm disc
    Rear 1-piston caliper hydraulic; single 240mm disc
    TIRES  
    Front Dunlop Geomax AT81 80/100-21 w/ tube
    Rear Dunlop Geomax AT81 110/100-18 w/ tube
    MEASUREMENTS  
    Rake (Caster Angle) 27°18'
    Trail 115mm (4.5 in.)
    Length 86.0 in.
    Width 32.6 in.
    Height 49.7 in.
    Ground Clearance 13.0 in.
    Seat Height 37.8 in.
    Wheelbase 58.5 in.
    Fuel Capacity 2.25 gal.
    Color Red
    Curb Weight* 244 lbs.



Source: Honda news

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