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Sportrax 400EX RedSportrax 400EX

The 2003 Sportrax 400EX dominates the competition with superb performance and handling.

Features & Benefits

New for 2003

  • New Honda Racing-inspired graphics.

  • New Red seat on Red model.

Unique Features

  • The 397cc RFVC(tm) engine draws its breath from the same engine that powers the bulletproof XR400R.

  • The ultra-lightweight TRX400EX weighs only 375 pounds.

  • Long-travel suspension exceeds that of even Honda's legendary TRX250R.

  • 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.

  • 35.5mm carburetor provides light throttle effort, superb air/fuel mixing and excellent driveability. An accelerator pump assures excellent throttle response for maximum power.

  • Stainless steel dual exhaust headpipes resist corrosion.

  • USDA-qualified muffler/spark arrester offers quiet operation and maximum power.

  • Solid-state 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 gears designed and ratios selected specifically 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(r) shock absorbers with five-position adjustable spring preload for superb ride quality over harsh terrain.

  • Pro-Link(r) 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

  • Engine design produces low emissions and 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.

  • Plastic fuel tank is durable and won't rust.

  • Dual 30-watt headlights integrated into front cowl provide distinctive sport style and excellent function.

  • 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 skidplate.

  • Heavy-duty steel skidplate protects rear brake disc and sprocket.

  • Engine cases protected by a tough urethane skidplate.

  • 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.

  • Ownership includes one-year complimentary Membership in the Honda Rider's Club of America(tm). Benefits include discounts, travel benefits, roadside assistance and much more. For HRCA(r) details, call 1-800-847-HRCA.

Available Accessories

  • Flag kit.


  • Fourtrax 400EX YellowModel: TRX400EX

  • Engine Type: 397cc RFVC air-cooled dry-sump single-cylinder four-stroke

  • Bore and Stroke: 85mm x 70mm

  • Carburetion: 35.5mm piston-valve with accelerator pump

  • Ignition: Solid-state CD with electronic advance

  • Starter: Electric

  • Clutch: Manual

  • Transmission: Five-speed

  • Driveline: O-ring-sealed chain

  • Suspension Front: Independent double-wishbone with Showa shocks, five-position spring preload adjustability; 8.2 inches travel

  • Suspension Rear: Pro-Link fully adjustable single Showa shock; 9.1 inches travel

  • Brakes Front: Dual hydraulic 174mm discs

  • Brakes Rear: Single 220mm disc

  • Tires Front: 22 x 7-10 knobby radial

  • Tires Rear: 20 x 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: 375 pounds

  • Fuel Capacity: 2.6 gallons, including 0.4-gallon reserve

  • Colors: Red, Yellow


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