The top speed of a 2004 Honda 400EX ATV can vary depending on various factors, such as rider weight, riding conditions, and modifications. However, in stock form, the Honda TRX400EX is generally capable of reaching a top speed of around 65-70 miles per hour (105-113 kilometers per hour).
It's important to note that riding at high speeds can be dangerous, and it's crucial to prioritize safety while operating any ATV. Always ride within the speed limits dictated by the area, obey local regulations, and wear appropriate safety gear, including a helmet, goggles, gloves, and protective clothing.
Additionally, modifications or changes to the ATV, such as aftermarket exhaust systems, intake modifications, or gearing adjustments, can potentially affect the top speed of the vehicle. If you are considering modifying your Honda 400EX or seeking precise speed measurements, it's recommended to consult with experienced riders, ATV specialists, or Honda dealerships for more accurate information based on your specific circumstances and modifications.