Specifications for a Honda 300EX

by Andrew Cohen

Honda's TRX line of ATVs is designed for use on rugged off-road trails. They are not street legal in most municipalities. The TRX 300EX is a mid-size ATV and Honda recommends that riders under 16 do not operate this model. The TRX 300X replaced the TRX 300EX for the 2009 model year.

Engine Specifications

The Honda TRX 300EX has an air-cooled 282cc single-cylinder four-stroke engine. The cylinder bore has a diameter of 2.9 inches and its stroke piston is 2.6 inches long. The induction system uses a piston-valve carburetor with accelerator pump and a diameter of 1.3 inches. The TRX 300EX features a capacitor discharge ignition system. The standard transmission of the TRX 300EX is a five-speed manual that featured a chain final drive.

Chassis Specifications

The front suspension of the Honda TRX 300EX is an independent double-wishbone that featured dual hydraulic shocks. This suspension also featured five-position spring preload adjustability and allowed the front axle to travel 7.1 inches. The rear suspension is swingarm with a single shock. It also has a five-position spring preload adjustability, allowing the rear axle to travel 7.9 inches. The front brake is a dual hydraulic disc and the rear brake is single hydraulic disc.


The Honda TRX 300EX is 67.7 inches long, 43.5 inches wide and stands 41.8 inches high, with a wheelbase of 45 inches. The ground clearance of this ATV is 4.6 inches and its seat sits 30.5 inches off of the ground. The turning radius of the TRX 300EX is 10.2 feet and its curb weight -- with a full tank of gas and all necessary fluids -- is 390 pounds.

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