The top speed depends on the specific TRX 250 model and how it’s set up. In stock form, the classic TRX250R two-stroke can reach roughly 65–75 mph (105–120 km/h), while the more common modern TRX250EX four-stroke typically tops out around 55–60 mph (88–97 km/h). Real-world speeds vary with gearing, weight, altitude, and maintenance.
Model variants and their typical top speeds
Below is a snapshot of common TRX 250 configurations and the speeds riders report in stock form. Individual results will vary based on condition, gearing, and rider factors.
- TRX250R (classic two-stroke race model): approximately 65–75 mph (105–120 km/h) stock, depending on gearing and rider weight.
- TRX250EX (late-model four-stroke): approximately 55–60 mph (88–97 km/h) stock.
In practice, the two-stroke TRX250R tends to be quicker at higher RPMs, while the four-stroke TRX250EX emphasizes smoother, more reliable power with a lower peak speed. Always consider that after-market modifications can shift these figures significantly.
What affects a TRX 250’s top speed
Gearing and exhaust modifications
Final drive ratios, intake and exhaust components, and engine tuning can raise or lower top speed. Performance parts often trade some low-end torque for a higher top end.
Weight, aerodynamics, and rider position
Rider weight and seating position influence aerodynamic drag and weight distribution, which can affect top-end performance, especially on open trails or desert sprints.
Maintenance, altitude, and temperature
Valve clearance, spark timing, compression, air-fuel mixture, and engine temperature—all affected by altitude and heat—can impact peak speed. A well-maintained engine under normal temperatures generally reaches the listed stock speeds more reliably.
Additional considerations
Stock numbers provide a baseline, but real-world use, terrain, and safety considerations matter. Always test at safe speeds in appropriate areas and adhere to local laws and ATV safety guidelines.
Summary
In summary, a Honda TRX 250’s top speed varies by model: about 65–75 mph (105–120 km/h) for the old TRX250R two-stroke and about 55–60 mph (88–97 km/h) for the TRX250EX four-stroke in stock form. Modifications, rider weight, and environmental conditions can push speeds higher or lower. Understanding the specific model and setup is essential for estimating accurate top speeds, and safety should always come first.