Yamaha YZ450FX Specs, Top Speed & YZ450F vs WR450F Comparison.

The Yamaha YZ450FX is a high-performance 449cc 4-stroke cross-country competition motorcycle designed for demanding off-road conditions. It combines the powerful engine platform of Yamaha's 450cc motocross machines with specific tuning for cross-country racing and enduro-style riding.

Yamaha YZ450FX Specifications

Here are the key Yamaha YZ450FX specifications:

Engine: 449cc, 4-stroke, liquid-cooled, DOHC, 4-valve
Cylinder: Single-cylinder
Bore × Stroke: 97.0 × 60.8 mm
Fuel System: Fuel injection
Transmission: 5-speed
Clutch: Wet multi-plate
Starting System: Electric starter
Final Drive: Chain
Front Suspension: KYB inverted fork, fully adjustable
Rear Suspension: KYB single shock, fully adjustable
Front Brake: Hydraulic disc
Rear Brake: Hydraulic disc
Front Wheel: 21-inch
Rear Wheel: 18-inch
Seat Height: Approximately 955–965 mm, depending on model year
Ground Clearance: Approximately 320–325 mm
Wheelbase: Approximately 1,480 mm
Weight: Approximately 115–119 kg, depending on model and market
Fuel Tank Capacity: Approximately 7.5–8 liters, depending on model year and market

The YZ450FX also supports the Yamaha Power Tuner, allowing riders to adjust engine characteristics and electronic settings to suit different riding conditions.

Yamaha YZ450FX Top Speed

So, how fast is the Yamaha YZ450FX?

The estimated top speed of a standard YZ450FX is approximately 120–130 km/h (75–81 mph). Yamaha does not officially publish a maximum-speed figure for this competition motorcycle, so real-world results can vary.

Top speed can be affected by:

Final gear ratio
ECU mapping
Engine condition
Rider weight
Tire size and type
Track conditions
Wind conditions
Terrain and riding position

Since the YZ450FX is designed primarily for cross-country competition, Yamaha focuses more on acceleration, traction, controllability, and off-road performance than maximum speed.

YZ450F vs YZ450FX vs WR450F Top Speed

Based on estimates from third-party testing and available performance information, the approximate top-speed comparison is:

Motorcycle	Estimated Top Speed	Main Character
Yamaha YZ450F	±137–145 km/h (85–90 mph)	Motocross & high-speed performance
Yamaha YZ450FX	±129–137 km/h (80–85 mph)	Cross-country & enduro
Yamaha WR450F	±120–135 km/h (75–84 mph)	Trail & technical enduro

Important: These top-speed figures are estimates, not official Yamaha specifications. Actual performance can vary depending on gearing, rider, terrain, ECU settings, and other conditions.

YZ450F vs YZ450FX — Which Is Faster?

The YZ450F is designed specifically for motocross racing and is optimized for strong performance across a motocross track. Its gearing and engine characteristics can give it a higher potential top speed in suitable conditions.

The YZ450FX, on the other hand, is based on Yamaha's 450cc performance platform but receives specific engine, ECU, transmission, and chassis tuning for cross-country riding.

The result is a motorcycle designed to deliver a strong combination of power, acceleration, traction, and control across different off-road conditions.

YZ450FX vs WR450F

The YZ450FX and WR450F are both Yamaha 450cc off-road motorcycles, but they have different priorities.

The YZ450FX is primarily focused on cross-country competition, offering aggressive performance and strong acceleration for faster off-road terrain.

The WR450F is more focused on enduro and trail riding, particularly in technical terrain such as rocky sections, steep climbs, tight trails, and slower-speed conditions.

Which Yamaha 450 Should You Choose?

🏁 For motocross and high-speed performance: Yamaha YZ450F

🔥 For cross-country racing and a combination of speed and off-road performance: Yamaha YZ450FX

🌲 For technical trails and enduro riding: Yamaha WR450F

Final Verdict

The Yamaha YZ450FX is an excellent choice for riders looking for a powerful 450cc motorcycle that can combine strong acceleration with excellent off-road control.

Compared with the YZ450F, the YZ450FX is more versatile for cross-country conditions. Compared with the WR450F, it has a more competition-oriented character.

If your priority is maximum speed and motocross performance, the YZ450F is the better choice. If you want high performance for cross-country racing, the YZ450FX is a strong option. For technical trail and enduro riding, the WR450F may be the more suitable choice.

Note: Specifications may vary depending on model year and market. Top-speed figures are estimates and should not be considered official Yamaha specifications.

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