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To our surprise, Honda had something else up their sleeve at their launch event, with an all-new model known as the CRF450RX. We say a new model because this isn't a replacement for the X model CRF450, but a new bike and model to take on the ever expanding off-road racing/cross country segment. Being that this is considered a serious off-road race bike, it's based directly off the new 2017 Honda CRF450R, but with a few key changes.

This includes a larger 2.2 gallon plastic gas tank, a kickstand, 18-inch rear wheel and off-road specific tires, different suspension settings, electric start standard, calmer power delivery through adjusted ECU settings, and modified engine brackets for off-road suited flex characteristics,

Specifications - 2017 Honda CRF450RX

  • Engine Type: 449.7cc liquid-cooled single-cylinder four-stroke
  • 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 ignition
  • Transmission: Constant-mesh 5-speed return
  • Final Drive: 520 chain; 13T/50T
  • Valve Train: Unicam® OHC, four-valve; 10.0mm intake, steel; 8.8mm exhaust, steel
  • Front Suspension: 49mm fully adjustable leading-axle inverted telescopic Showa coil-spring fork; 12.0 in. travel
  • Rear Suspension: "Pro-Link swingarm system; fully adjustable Showa single shock; 12.3 in. travel.
  • Front Brakes: Single 260mm hydraulic disc
  • Rear Brakes: Single 240mm hydraulic disc
  • Front Tires: Dunlop Geomax AT81 90/90-21 with tube.
  • Rear Tires: Dunlop Geomax AT81 120/80-18 with tube.
  • Rake (Caster Angle): 27°22’
  • Trail : 116.0mm (4.6 in.)
  • Seat Height: 37.8 in.
  • Ground Clearance: 12.9 in.
  • Wheelbase: 58.1 in.
  • Fuel Capacity: 2.25 gal.
  • Color: Red
  • Curb Weight (Full tank of fuel, lubricants, tires, ready to ride): 261 lbs.


Johnny Campbell: Riding the 2017 Honda CRF450RX - More Motocross Videos

Honda Press Release Below:

For 2017, Honda offers the brand-new CRF450RX, which is based on the 2017 CRF450R but with a number of differences that make it appropriate for closed-course off-road racing like the GNCC series campaigned by the JCR Honda team. Like its motocross-focused sibling, the CRF450RX is designed for maximum agility and performance, offering owners superior power along with effortless handling—the ideal woods-racing combination.

Engine/Drivetrain:

  • Smoother ignition map than CRF450R for better performance in low-traction situations.
  • Downdraft intake layout increases power by reducing resistance, improving air-charging efficiency.
  • Combustion chamber with high compression ratio, narrow valve angle for efficiency.
  • Use of finger rocker arm allows high valve lift while retaining compact Unicam layout.
  • Coils on valve springs have oval cross-sections to allow low engine height.
  • Port layout with straight flow for efficiency.
  • Diamond-like carbon (DLC) on piston pin, rocker arm minimizes friction, increases durability.
  • Dual muffler with gradual pipe bends for smooth exhaust flow.
  • Standard electric start, with kick start as a backup.

Chassis/Suspension:

  • Compared to CRF450R, suspension settings are more appropriate for technical off-road conditions.
  • With a 2.25 gallon capacity, the plastic fuel tank is larger than that of the CRF450R for increased range off-road.
  • Forged-aluminum side stand is standard to allow trailside parking.
  • Off-road-focused, durable Dunlop Geomax AT81 tires.
  • One-tooth larger rear sprocket than CRF450R, for better performance in tight woods conditions.
  • Different cylinder hanger than CRF450R, for comfort in technical off-road conditions.
  • Chassis layout maximizes traction through concentration of mass, low center of gravity.
  • New, lighter sixth-generation aluminum twin-spar frame with revised geometry; allows improved cornering performance through reduction of torsional stiffness (lateral stiffness is unchanged).
  • Lightweight swingarm assembly is stiff vertically and laterally.
  • Rear-suspension location lowers center of gravity.
  • Lightweight aluminum rear subframe with extruded gussets.
  • Coil-spring 49mm Showa fork.
  • Plastic bodywork with smooth layout and film-insert graphics for appearance and durability.
  • Front fender shape allows efficient air path to radiator.

Credit
ML512
First Look: 2017 Honda CRF450R and CRF450RX
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