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2019 Honda CRF450RX

Chaparral Motorsports
May 23, 2018
(Press Release)

Campaigned by JCR Honda's Trevor Bollinger and Trevor Stewart in GNCC and WORCS competition, respectively, the CRF450RX is an off-road weapon fully prepared for earning trophies in closed-course off-road competition. For 2019, the bike inherits the same performance-enhancing features as the CRF450R, including key updates for lighter weight, added power, and enhanced handling performance. Add in off-road-specific features that help bring CRF450RX riders to podiums the country over, and you have a highly advanced off-road racer.

Honda's CRF450R is a dominant open-class MX machine. And the equivalent for all you enduro riders: the 2019 CRF450RX. It rocks all the features and upgrades of our latest CRF450R, but has some special touches that fine-tune it for enduro use. Like a bigger fuel tank. A sidestand. An 18-inch rear wheel. And special suspension settings. Along with the CRF450R, it gets an all-new chassis and swingarm, new fuel-injection settings that spray twice per cycle to better atomize the fuel, a special launch-control setting, new Renthal Fatbar and all the rest. We've never built an enduro bike this race-ready. And neither has anyone else.

CRF450RX Key Points

Large-capacity, 2.25 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

Side stand

Sealed drive chain to withstand the elements

Suspension with settings dedicated to closed-course off-road use


449cc single-cylinder engine with Unicam® cylinder head, downdraft intake tract, and electric start

Updated cylinder head design, with specific changes near the exhaust ports, achieves improved exhaust efficiency and contributes to increased power across the rev range

Revised clutch lifter and pressure plate allows optimum oil supply to clutch plates and friction discs, resulting in enhanced durability

New scavenge pump design features two 12mm pumps, up from a single 16mm pump, for increased lubrication and reduced friction inside the engine, improving peak performance and enhancing over-rev characteristics

All-new piston oil jet uses five nozzle holes and a refined pattern to improve cooling efficiency and reduce knocking

Shift sensor adopted to establish an ignition map for each gear, enabling optimum running

Exclusive ignition timing settings for ideal engine performance and rideability in off-road situations

Utilizing the space gained by eliminating the kick starter and using a compact electric starter, a new exhaust features a larger pipe diameter and optimized design at the branching location for increased power. Previously 31.8mm, the right and left pipes are now 35mm and 43mm, respectively. In addition, the total tube length (from exhaust port to muffler end) is up 98mm on the right and 187mm on the left.

Selectable HRC launch control offers riders great start performance in closed-course off-road race situations

Updated Standard, Smooth and Aggressive riding modes enable easy tuning depending on rider preference or conditions


Optimized frame for improved traction and cornering feel, as well as reduced weight

Swingarm is redesigned to be lighter and have appropriate rigidity, endowing the 2019 CRF450RX with great handling and traction

Specially tuned Showa 49mm fork uses low-friction oil for optimum feel

Rear suspension uses dedicated-rate, 52 N/mm spring for enhanced comfort and performance in closed-course off-road races

Revised shock linkage works with all-new swingarm to provide optimum performance over bumps

Forged aluminum side stand is designed to be lightweight yet strong, with a new design to accommodate changes to the 2019 model-year swingarm

New, lighter front brake caliper uses a pair of 30mm and 27mm pistons, versus identical 27mm pistons, for added braking performance

Updated front brake hose has reduced expansion for more precise braking

Top triple clamp features two handlebar-holder locations for moving the handlebar back and forth by 26mm, ensuring rider comfort. When handlebar holder is turned 180 degrees, the handlebar can be moved an additional 10mm from the base position, resulting in four total unique riding positions.

New Renthal Fatbar® handlebar is positioned 15mm lower than in 2018 for  a more active riding position, while also contributing to lightweight steering system

Newly shaped footpegs are 20% lighter and shed mud more easily, giving the rider great feel and confidence in challenging riding conditions

2.2 gallon resin fuel tank is durable and offers optimum range for long closed-course off-road races

Redesigned fork protectors offer improved coverage

Black rims offer strong presence, parked in the pits or out on the trail

In-mold graphics last long and are resistant to peeling caused by washing or abrasion

Dunlop Geomax AT81 tires provide optimum feel and traction in challenging riding conditions

Model CRF450RX
Type 449.7cc liquid-cooled 10º single-cylinder four-stroke
Valve Train Unicam® OHC, four-valve; 10.0mm intake, steel; 8.8mm exhaust, steel
Bore x Stroke 96.0mm x 62.1mm
Compression Ratio 13.5:1
Induction Programmed fuel-injection system (PGM-FI); 46mm 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/50T
Front 49mm fully adjustable leading-axle inverted telescopic Showa coil-spring fork
Rear Pro-Link system; fully adjustable Showa single shock
Front 2-piston caliper (30mm, 27mm) hydraulic; single 260mm disc
Rear 1-piston caliper hydraulic; single 240mm disc
Front Dunlop Geomax AT81 90/90-21 w/ tube
Rear Dunlop Geomax AT81 120/90-18 w/ tube
Rake (Caster Angle) 27°25'
Trail 116mm (4.6 in.)
Length 85.6 in.
Width 32.6 in.
Height 49.6 in.
Ground Clearance 12.9 in.
Seat Height 37.8 in.
Wheelbase 58.2 in.
Fuel Capacity 2.25 gal.
Color Red
Curb Weight* 255 lbs.

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