1999 Honda TRX 400EX – The Legendary Sport ATV That Defined an Era

At the heart of the 1999 TRX 400EX is a 397cc air-cooled, SOHC, four-stroke single-cylinder engine, adapted from Honda’s XR400R dirt bike. Known for its smooth power delivery and near-indestructible build, this engine produces plenty of low-end torque for climbing and enough top-end punch for high-speed runs.

Paired with a 5-speed manual transmission with reverse, riders get full control over power delivery, making it equally enjoyable for technical trail riding and wide-open desert runs.

Chassis & Suspension

The 400EX rides on a lightweight steel frame built for durability and precision handling. Its independent double-wishbone front suspension offers 8.2 inches of travel, while the Pro-Link rear suspension delivers 9.1 inches — soaking up bumps, jumps, and rough terrain with ease.

Large aluminum wheels paired with aggressive knobby tires provide the grip and stability needed for demanding off-road conditions.

Ergonomics & Styling

From the moment you throw a leg over the TRX 400EX, you’ll notice its low, aggressive stance and narrow seat design that lets you shift your weight with ease. The sporty plastic bodywork — available in Honda red or yellow — not only looks great but also stands up to years of off-road abuse.

Braking & Control

Stopping power comes from hydraulic disc brakes front and rear, giving confident braking performance in mud, sand, or hardpack. The wide handlebars, lightweight clutch lever, and responsive throttle make it beginner-friendly while still thrilling for seasoned riders.

Key Specifications – 1999 Honda TRX 400EX

• Engine: 397cc air-cooled, SOHC, 4-stroke, single-cylinder

• Transmission: 5-speed manual with reverse

• Front Suspension: Independent double wishbone, 8.2” travel

• Rear Suspension: Pro-Link single shock, 9.1” travel

• Brakes: Hydraulic discs (front & rear)

• Tires: 22×7-10 front / 20×10-9 rear

• Seat Height: 31.9 inches

• Dry Weight: ~375 lbs

• Fuel Capacity: 2.6 gallons