2018 Honda CRF450RX


When the Honda CRF450RX hit the scene last year, it blew everyone away. This was more than just a premier-class motocrosser with an electric starter. It’s a serious off-road weapon fully optimized for trophy-class competition in enduros, hare scrambles, and GNCC racing. This year we’ve upgraded the battery to a lithium-ion unit for lighter weight and better performance, and removed the kickstarter to also save weight. If you’re serious about winning and want the biggest advantage you can find, the 2018 Honda CRF450RX delivers.


  • ELECTRIC START: The 2018 CRF450RX comes with a lightweight electric-starting system as standard equipment. The lithium-ion battery is also super light. It’s a win/win combination.
  • LARGE FUEL TANK: Stopping for fuel in a race costs time. With the CRF450RX’s 2.2-gallon fuel tank, depending on the course and how much roost you’re making everyone else eat, it’s possible to make it through a three-hour enduro with just one fuel stop.
  • ENGINE MODE SELECT BUTTON: This simple, handlebar-mounted button lets you dial in engine power delivery character with a push of your thumb. Choose between Standard, Smooth, and Aggressive, depending on course conditions.
  • 260 MM FRONT BRAKE: The CRF450RX’s large front-brake disc measures a whopping 260mm. You get great brake feel and a wave pattern that cuts down on weight. Front and rear brake-disc guards are part of the package, and are sure to be popular with off-road riders.
  • SKID PLATE: A factory skid plate is light and offers the engine and lower-frame protection that a motocross racer demands. The smooth contours help keep you from getting hung up on logs and rocks, too.
  • KICKSTAND: It seems like a small detail, but off-road bikes can sometimes need a kickstand. Which is exactly why you’ll find this light, compact unit added right from the factory.


  • 18-INCH REAR WHEEL: An 18-inch rear wheel is another indication of our fine-tuning the CRF450RX for off-road racing. Whether it’s red Georgia clay, Florida loam, or Baja sand and rocks, you’re going to find this bike offers the performance you need.
  • OFF-ROAD SUSPENSION WITH SPRING FORK: Designed specifically for the demands of off-road riding, the CRF450RX’s Showa® Spring Fork and suspension components are fully adjustable and chosen to give you the ultimate tunability and performance in the field for changing conditions.
  • NEW DUAL-MUFFLER EXHAUST SYSTEM: The CRF450RX’s dual exhaust system is compact and positioned closer and lower in the frame’s center to take weight off the rear end and bring more mass to the bike’s center for superior handling.


  • DUNLOP GEOMAX OFF-ROAD TIRES: The Geomax AT81 tires are specially designed for off-road riding, and help the CRF450RX hook up and put its holeshot traction to the ground.
  • ALUMINUM FRAME: Our twin spar aluminum frame positions the rear shock’s mounting point low, opening up the airbox area and contributing to a lower center of gravity. The frame geometry also helps give you more traction, and that means more holeshots!
  • CYLINDER HEAD LAYOUT: The CRF450R uses our latest finger-follower rocker design. The Unicam cylinder head remains the most efficient in the MX world, giving you the design and performance of a double-overhead-cam layout but the compactness of a single-overhead-cam design.
  • SCAVENGE PUMP: Deep in the engine, there’s a special oil scavenge pump. You may never see it, but it helps keep the CRF450RX’s overall design compact.

General Information

Manufacturer Honda
Model Year 2018
Model CRF450RX
Model Code CRF450RXJ
Color Red



Front - Single 260 mm disc with twin-piston caliper

Rear - Single 240 mm disc


Front - Dunlop Geomax AT81 90/90-21

Rear - Dunlop Geomax AT81 120/90-18


Weight Curb - 257 lb. (Includes all standard equipment, required fluids and full tank of fuel—ready to ride.)
Ground Clearance 12.9 in.
Wheelbase 58.1 in.
Seat Height 37.8 in.


Transmission Close-ratio five-speed
Final Drive #520 Chain; 13T/50T


Engine Unicam four-valve - Single-cylinder four-stroke
Displacement 449 cc
Bore x Stroke 96 x 62.1 mm
Compression Ratio 13.5:1
Fuel System Programmed Fuel Injection (PGM-FI), 46mm downdraft throttle body
Fuel Capacity 2.2 gal.
Ignition Full transistorized with electronic advance
Cooling liquid-cooled



Front - 49 mm inverted Showa fork with rebound and compression damping adjustability; 12.0 in. of travel

Rear - Pro-Link® Showa single shock with adjustable spring preload, rebound and compression damping adjustability; 12.28 in. of travel

Rake 27° 22' (Caster Angle)
Trail 4.6 in. (116 mm)