The Yamaha YZ250F is a motocross bike manufactured by Yamaha. Equipped with a four-stroke engine, the bike produces maximum peak output power and maximum torque. With this drive-train, the YZ250F can reach speeds of up to 65 to 75 mph.
It comes with a lightweight aluminum frame that makes handling very easy. Combine this with the adjustable suspension and racing wheels, your opponents will never catch up. Want to learn more about the Yamaha YZ250F?
Keep reading!
The Engine
If high-end performance and speed are your things, then look no further than Yamaha’s YZ250F’s 250 cc engine. This is a liquid-cooled DOHC 4-valve power plant that is fuel injected and features symmetrical intake and exhaust ports. Known for its class-leading low-end and mid-range torque, the engine comes with a straight downdraft intake that’s forward positioned.
The shape of the intake port is now wider and straighter. As such, the port’s volume increased by 10% and so did the flow rate by 0.05 liters per second. Besides the upgrade to the intake, the engine also features an advanced fuel injection system.
The new fuel injection system has a 44mm throttle body that injects fuel through a 12-hole injector. Fed by a high-pressure electric fuel pump, the end result is excellent rideability under a wide range of riding conditions.
Thanks to the many upgrades, the engine now revs much faster than the previous models. As a result, many riders now love the super smooth power of the new model over the abrupt driving force of the previous model.
It gets even better. Yamaha now provides an innovative power tuner app available for free on the Apple App Store and Google Play Store. The app brings the power of the Power Tuner to your mobile device. As such, you can connect to your bike’s onboard computer and adjust the air/fuel mixture plus ignition timing maps. This helps improve engine performance for the track as well as monitor engine run time and other systems.
Aerodynamics
Everything that moves through the air is always affected by the principles of aerodynamics. Even those who have ridden a motorcycle will tell you of the enormous forces the rider and bike have to push through moving air. The direct connection between the rider, machine, and environment, it’s the reason why motorcycling is fun.
Unlike cars, motorcycles are awful at slicing through moving air no matter their size or shape. This is why several companies have not made any meaningful effort to improve their aerodynamics until now.
The new Yamaha YZ250F comes with a lightweight aluminum frame with a fully adjustable inverted fork and KYB single shock for the rear. Yamaha also revised the frame thickness and added a new front axle and triple clamp. This gives the bike better cornering thanks to the planted front end.
Besides having a lightweight frame, Yamaha improved the bike’s aerodynamics by installing a flatter seat and narrow fuel tank. This removed excess weight from the bike making it lighter. As such, the YZ250F makes it easier to slice through moving air.
To increase top speed, we recommend changing the front and rear sprockets. Next, you need to find better tires for your bike. It’s best to swap out your tires that suit your riding style and track or terrain conditions.
You should also use better fuel such as higher octane premium gas. While it’s a bit expensive, spending the extra money is worth the ride.
Tires and Suspension
If you love trail riding on your Yamaha YZ250F and still want to go on the streets, you need to have the right tires. The YZ250F front tire rim dimensions are 80/100-21 while the rear tire rim dimensions are 100/90-19. It comes with race-proven motocross tires quality engineered and designed for intermediate terrain.
Derived from motocross racing technologies, the tires feature improved rubber compounds and fine-tuned casing construction. This gives the tire better feedback.
To improve cornering, they gave the tires an aggressive tread design. Best for all machines 50cc to 450cc, the tires are more durable and cover a wide range of terrain. When it comes to suspensions, Yamaha did lots of research to develop the perfect unit to improve your riding experience.
Now you can say goodbye to having the option of chassis stability over comfort and traction. The YZ250F suspension and shock include a highly efficient high-speed compression adjuster. This adjuster allows you to adapt your set to any terrain or track condition that comes your way.
The KYB coil spring-type fork with speed-sensitive camping delivers a balance between bump absorption and handling. It also has a linkage-type rear suspension that comes with a KYB shock. This helps provide less pitch especially as you enter or exit a corner. Besides that, it improves stability which is necessary to stay ahead of your opponents.
To improve your bike’s grip, we recommend all-terrain motorcycle tires. These tires can cross between soft, intermediate, and hard terrain. They feature race-proven tread design patterns, rubber compounds, and fine-tuned casing constructions. Derived from a variety of racing technologies, the tires provide better cornering even when racing at lean angles.
Read also: Yamaha Top Speed, Specs, And Features
Transmission and Final Drive
The Yamaha YZ250F comes with a constant-mesh 5-speed transmission. This is a type of transmission where the gears are usually meshed or fixed to their positions. As such, they remain engaged all the time.
Since the gears are constantly meshing, the likelihood of the gear teeth getting damaged is minimal. In fact, there’s typically less wear on the gears. If a rider makes a bad change in gears, the damage would only be limited to the multi-plate wet clutch.
The Yamaha YZ250F comes with a 5-speed gearbox. Here are the gear ratios:
- First gear:2.143 (20/14)
- Second gear:1.750 (18-16)
- Third gear:1.444 (26/18)
- Fourth gear:1.222(22/18)
- Fifth gear:1.042(24/24)
The YZ250F final drive is chain based. The front, rear, and chain Renthal sprockets are precision CNC machined. This gives you the ultimate combo of lightweight and strength. Made from case-hardened alloy steel, they provide a combination of hardness and strength.
Race-proven, their advanced tooth profile and accuracy ensure maximum power transfer. Basically, they supply power to the front and rear wheels of the race bike.
Frequently Asked Questions
How fast can a Yamaha 250 go?
The Yamaha YZ250F can reach a top speed of 65 MPH to 75 MPH. This is roughly 105 kmh to 120 kmh. For a bike, this speed is remarkable.
Which is faster YZ250 or YZ250F?
The YZ250 is faster than the YZ250F. This is because the former has a 2 stroke engine which only makes one complete revolution to complete the four stages of combustion. The latter makes two revolutions. As such, the 2-stroke makes more power than the 4-stroke.
Is a Yamaha YZ250F a good beginner bike?
Yes, the Yamaha YZ250F is a good beginner bike. This is because the YZ250 is a two-stroke and they are harder to learn.
Final Words
The Yamaha YZ250F is a racing bike. It’s equipped with the latest technologies and innovations that greatly improve the bike’s performance on the track. It has a broad torque curve that helps any rider leave his opponents in the dust.
As a true dirt bike, the YZ250F comes with a lightweight frame which makes it easy for the rider to maneuver the bike. While it’s an absolute beast on the track, you can make changes to the air filter giving the bike more pulling power. The more airflow into the intake, the more power, and speed. You can also change the ECU and suspension to improve the bike’s speed.