TRX400EX

by Nick Harris on October 2nd, 2007

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.

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, take a look at these from eBay motors.