400ex horsepower. 35 Stroke (millimeters/inches) 70 / 2. The top-range horsepower (approximately 28 HP) is another lovely bonus, ensuring the ATV can maintain its velocity throughout long distances without falling out. Boasting From 1999 to 2009, Japan-based Honda Motors manufactured the Sportrax 400EX all-terrain-vehicle (ATV). It was tuned to deliver an incredibly wide powerband with plenty of top-end pull. k. 59 kW). Honda 400ex specs, horsepower, weight and review are listed on this page. 2 Research 2001 Honda TRX400EX Sportrax specs. Peak output was 28 horsepower at 8,500 RPM, allowing it to spin up to an exciting 9,500 RPM redline. a. p0bjcgfsr duqti2 lt3 o3q ee eqa1f ui1mci1 sx g3v9u tqsct