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With aggressive styling and the convenience of a Reverse gear, the sport model TRX400EX combines high performance and refinement like nothing else in its class.

Features & Benefits

New for 2006

  • New Black color joins Red.

Unique Features

  • The 397cc RFVC engine draws its breath from the same engine that powered the bulletproof XR™400R.
  • Rugged steel frame with removable subframe for easy maintenance.
  • Beautiful one-piece cast-aluminum swingarm offers exceptional rigidity.
  • Radial tires for exceptional handling.
  • Triple disc brakes provide superb stopping power.
  • Aggressive body style complements the all-sport appearance.


  • High-performance 397cc dry-sump air-cooled four-stroke single-cylinder engine.
  • Radial Four-Valve Combustion Chamber (RFVC) for maximum combustion efficiency and horsepower.
  • Camshaft timing developed especially to meet ATV requirements for torque and useable horsepower.
  • Gear-driven counterbalancer minimizes engine vibration for smooth operation.
  • Dual intake and exhaust ports for maximum engine efficiency in sport operating conditions.
  • Maintenance-free automatic cam-chain tensioner.
  • Closed crankcase vent system safeguards against engine oil contamination.
  • 38mm carburetor provides light throttle effort, superb air/fuel mixing and driveability. An accelerator pump ensures excellent throttle response for maximum power.
  • Stainless steel dual exhaust head pipes resist corrosion.
  • USDA-qualified muffler/spark arrester offers quiet operation and maximum power.
  • CD ignition with electronic advance and 9100-rpm engine rev limiter.
  • Heavy-duty clutch has 2mm-thick plates designed to stand up to sport-ATV demands.
  • High-efficiency oil cooler supplements the large-capacity oil tank for maximum engine cooling.
  • Five-speed transmission with Reverse has gears and ratios specifically designed for sport-ATV use.


  • Round-tube steel frame with removable subframe is lightweight, durable and very strong.
  • One-piece cast-aluminum swingarm for maximum strength, rigidity and durability.
  • Independent double-wishbone front suspension offers 8.2 inches of travel from twin Showa shock absorbers with five-position adjustable spring preload for superb ride quality over harsh terrain.
  • Pro-Link® rear suspension with a fully adjustable large-diameter aluminum-body piggyback Showa shock absorber provides 9.1 inches of travel.
  • Triple disc brakes for excellent stopping power and a weight-saving aluminum rear caliper stay.
  • All Pro-Link components are made of aluminum to further reduce vehicle weight.
  • Lightweight aluminum wheels reduce unsprung weight for even better handling.
  • Radial tires with knobby pattern provide superb traction and cornering ability.
  • Durable and lightweight heavy-duty O-ring-sealed drive chain.
  • Easy-to-use eccentric chain adjuster.

Additional Features

  • TRX™450R-inspired bodywork.
  • Engine design meets California Air Resources Board (CARB) off-road emissions standards.
  • Convenient push-button electric starting.
  • Long, narrow seat provides excellent comfort and superb sport riding ergonomics.
  • Aggressive styling of front cowl, fuel tank and fenders complements pure-sport ATV design.
  • Durable plastic fuel tank.
  • Dual 30W headlights integrated into front cowl provide distinctive sport style and excellent function.
  • Rear brakelight.
  • Snorkel-type airbox to avoid water and dirt contamination.
  • Washable, two-stage, large-capacity foam air filter.
  • Oil tank features a dipstick for easy maintenance.
  • Comfortable dogleg levers; clutch lever has cable adjuster and dust cover.
  • Tough steel front skid plate.
  • Heavy-duty steel skid plate protects rear brake disc and sprocket.
  • Engine cases protected by a tough urethane skid plate.
  • Rear mudguard with rigid footrests.
  • Maintenance-free battery.
  • Keyed ignition switch offers added security.
  • Multi-function handlebar switch assembly is simple to operate.
  • Easy-to-use parking brake.
  • Tool kit includes low-pressure air gauge and owner's manual.
  • Assembled in Timmonsville, South Carolina.
  • Transferable six-month limited warranty; extended coverage available with a Honda Protection Plan.
  • Ownership includes one-year complimentary membership for an individual in the Honda Rider's Club of America™ (HRCA®). Benefits include: discounts, travel benefits, roadside assistance for ATV transport vehicle while ATV is being transported, one year of Honda Red Rider ATV™ magazine, access to HRCA Clubhouse Web site (www.hrca. and access online to Honda Common Service Manual. For HRCA details, call 1-800-847-HRCA. For dealers only, please call (310) 783-3958.

Available accessories

  • Flag kit.

2006 Honda TRX400EX Specifications

  • Engine Type: 397cc RFVC air-cooled dry-sump single-cylinder four-stroke
  • Bore and Stroke: 85mm x 70mm
  • Carburetion: 38mm piston-valve with accelerator pump
  • Ignition: CD with electronic advance
  • Starter: Electric
  • Clutch: Manual
  • Transmission: Five-speed with reverse
  • Driveline: O-ring-sealed chain
  • Suspension:
         Front: Independent double-wishbone with Showa shocks, five-position spring preload adjustability; 8.2 inches travel
         Rear: Pro-Link fully adjustable single Showa shock; 9.1 inches travel
  • Brakes:
         Front: Dual hydraulic 174mm discs
         Rear: Single 220mm disc
  • Tires:
         Front: 22 x 7-10 knobby radial
         Rear: 20x 10-9 knobby radial
  • Length: 72.2 inches
  • Width: 45.3 inches
  • Height: 43.7 inches
  • Seat Height: 31.9 inches
  • Ground Clearance: 4.3 inches
  • Wheelbase: 48.4 inches
  • Turning Radius: 10.5 feet
  • Dry Weight: 386 pounds
  • Fuel Capacity: 2.6 gallons, including 0.4-gallon reserve
  • Color: Red, Black

For highly experienced riders 16 years of age and older.

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