TRX400EX

by Nick Harris

Honda TRX400EX – The Honda TRX400EX shares its 397cc engine with the XR400R. The TRX400EX ATV also sports a sturdy steel frame with removable subframe and cast aluminum swingarms that offer exceptional rigidity. Triple disc brakes provide the TRX400EX with much needed stopping power and the aggresive TRX 400EX body style compliments the driveline well.

Honda ATV gave the TRX400EX a high performance 397cc dry-sump, air-cooled, four-stroke single cylinder engine. A radial four valve combustion chamber (RFVC) takes care of creating horsepower. Honda paid particular attention to camshaft timing in order to meet the tough requirements set for torque and useable horsepower. The TRX400EX ATV also sports dual intake and exhaust ports for maximum engine efficiency. The TRX400EX has a five-speed transmission with Reverse to round out it’s arsenal of “go fast”.

The extremely popular and fast Honda TRX400EX ATV remained a top enthusiast choice for many years. Now that Honda has released the all new TRX450R ATV model and stopped production of the TRX 400 it may become harder to find high performance TRX400ex parts, but not too hard, the TRX400EX was a runaway hit and many were produced.

honda trx400ex atv
  • Model Year : 2007
  • Model : TRX400EX
  • Engine : RFVC, dry-sump, 1-cylinder, 4-stroke
  • Displacement : 397 cc
  • Bore and Stroke : 85 x 70 mm
  • Carb : 38 mm piston-valve with accelerator pump
  • Cooling : Air-cooled
  • Starter : Electric
  • Clutch : Manual
  • Transmission : 5-speed with reverse
  • Final Drive : O-ring-sealed chain
  • Ignition : CD with electronic advance
  • Suspension Front : Independent double-wishbone with Showa shocks, 5-position spring-preload adjustability, 8.2 inches of travel
    Rear : Pro-Link fully-adjustable single Showa shock, with 9.1 inches of travel
  • Brakes Front : Dual hydraulic 174 mm discs
    Rear : Single 220 mm disc
  • Tires Front : 22 x 7-10 knobby radial
    Rear : 20 x 10-9 knobby radial
  • Length : 72.2 inches
  • Width : 45.3 inches
  • Height : 43.7 inches
  • Wheelbase : 48.4 inches
  • Seat Height : 31.9 inches
  • Turning Radius : 10.5 feet
  • Ground Clearance : 4.3 inches
  • Dry Weight : 386 lbs.
  • Fuel Capacity : 2.6 gallons including 0.4 gallon reserve
  • Colors : Black, Red

update 04-19-2009: Join us in the new ATV forum and share your 400EX experiences. You don’t have to look very hard to find a 400EX.

2004 Honda 400ex Tons Of Extras Mint 449cc Fast
$500.00
Honda Race 400ex, 440 Nice  No Reserve
$255.00
2008 Honda 400ex Trx400ex Awesome Shape Low Reserve
$2,000.00
New 2008 Honda Trx400ex Sport Quad Trx400 Trx 400 400ex
$3,800.00
Brand New 2008 Honda Trx 400ex, Trx400ex, Trx 400 Ex
$4,544.00
2005 Honda 400ex
$610.00
 Lk  Honda 400ex - Race Ready - Fastest Around
$100.00

Read more on Honda TRX450R and Suzuki Z400 – 2008 and Honda 300ex and KFX450R KFX 450r Review and Yamaha Raptor 700r 2008 and Polaris Predator 500 and Kawasaki KFX 400 and Yamaha Blaster ATV 2006 and Yamaha YFZ450 YFZ 450 .



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