CHAMPIONSHIP ‑ PROVEN!

The 2‑straight MX & SX West Champ and undisputed benchmark in 250 motocross bikes.

TOP FEATURES

1 . Innovative Engine Design

A liquid-cooled, DOHC 4-valve, fuel-injected engine with forward- positioned downdraft intake delivers class leading engine power. This
design allows for unmatched mass centralization, concentrating the
motorcycle’s key components—engine, fuel tank and exhaust
system—toward the center of the motorcycle achieving light and
nimble handling performance.

2 . Durable Transmission

The transmission gears, dogs and shift mechanisms are designed to
smooth gear changes and improve durability under the heavy demands
of motocross racing.

3 . Bilateral Beam Aluminum Frame

A Yamaha’s renowned bilateral beam aluminum frame features compact
overall dimensions that balance minimal weight with the strength and
rigidity needed for race-winning performance. This frame features a
forged section at the swingarm pivot and engine mounting brackets
for tuned responsiveness, handling and unmatched lightweight
feeling.

4 . Refined Suspension Settings

Industry-leading, fully adjustable KYB® spring-type fork with speed
sensitive damping features advanced valving for improved suspension
feel and balance. The linkage type rear suspension features a KYB®
rear shock also features settings optimized for ideal damping
characteristics.

5 . GYTR® Power Tuner Ready

Accessory GYTR Power Tuner lets owners adjust air/fuel mixture and
ignition timing maps to match engine performance characteristics to
the rider and track conditions in a matter of seconds with the push of
a few buttons, as well as monitor engine diagnostic codes.


FEATURES & BENEFITS

ENGINE

Innovative Engine Design

The liquid-cooled, DOHC 4-valve, fuel-injected engine features a forward-positioned straight downdraft intake with symmetrical intake and exhaust ports. A compact, high compression combustion chamber delivers outstanding engine character with a focus on top-end power delivery.

Piston, Rod and Crankshaft Balance

A flat-top forged piston features a bridge-box design for additional strength with minimal weight. The piston, rings and DLC-coated piston pin, along with the offset cylinder configuration, all reduce friction loss and contribute to quick response. The engine’s intake
ports, cam profiles, high-strength connecting rod and optimized crank and counterbalancer all work together to produce potent high-rpm power with user-friendly delivery and exceptional reliability.

Advanced ECU and Fuel Injection

The adjustable fuel injection system uses a 44mm throttle body fed by a high-pressure battery-less electric fuel pump. This ensures optimum fuel atomization and air/fuel calibration for excellent rideability in a wide range of riding conditions. The system controls the volume of fuel injected and the ignition timing based on engine rpm and throttle
opening, providing hesitation-free response and controllability.

Wraparound Rear Positioned Exhaust Layout

An innovative exhaust pipe design improves mass centralization and power development characteristics. This layout moves the rear end of the exhaust pipe farther forward and enables a muffler position close to the center of the mass.

Durable Transmission

The transmission gears, dogs and shift mechanisms are designed to smooth gear changes and improve durability under the heavy demands of motocross racing.

GYTR Power Tuner Ready Accessory

GYTR Power Tuner lets owners adjust air/fuel mixture and ignition timing maps to match engine performance characteristics to the rider and track conditions in a matter of seconds with the push of a few buttons, as well as monitor engine diagnostic codes.

ADDITIONAL FEATURES

Embedded Graphics

Yamaha’s unique embedded graphics are built into the bodywork for extended durability, resisting both peeling and damage.

Adjustable Handlebar Mounts

The 4-position adjustable handlebar mounts are rubber mounted to improve comfort and reduce handlebar vibration.

Race Winning Details

The YZ450F includes top-spec details, including 1-1/8” aluminum tapered handlebars, wide 55mm footpegs, a quick-adjust clutch perch, stylish black rims and gold chain.

Simplified Servicing

Sleek air cleaner cover helps prevent contact with the quick-release quarter-turn Dzus® air box fasteners and provides tool-less access to the air filter, positioned at the front of the bike to avoid roost from the rear wheel.

CHASSIS/SUSPENSION

Bilateral Beam Aluminum Frame

A Yamaha’s renowned bilateral beam aluminum frame features compact overall dimensions that balance minimal weight with the strength and rigidity needed for race-winning performance. The frame’s swingarm pivot section and engine mounting brackets are tuned for stability, responsiveness and sharp cornering.

Mass-Centralization

The engine, aluminum muffler and fuel tank are positioned close to the machine’s center of gravity. This layout contributes to centralized mass for a lightweight handling feeling on the track. The wide 55mm footpegs help lower the rider’s center of gravity for improved machine balance, control and rider comfort.

270mm Front Brake

A large 270mm front brake disc is the same system fitted to the YZ450F™, and uses an aggressive pad material for exceptional stopping power and braking control. Out back, a durable heat-resistant rear rotor boosts brake durability.

Refined Suspension Settings

Industry-leading, fully adjustable KYB® spring-type fork with speed sensitive damping features advanced valving for improved suspension feel and balance. The linkage type rear suspension features a KYB® rear shock also features settings optimized for ideal damping
characteristics.


SPECIFICATIONS:

Engine Type: 250cc liquid-cooled DOHC 4-stroke; 4 titanium valves
Bore x Stroke: 77.0mm × 53.6mm
Compression Ratio: 13.5:1
Fuel Delivery: Keihin® fuel injection, 44mm
Ignition TCI: Transistor Controlled Ignition
Transmission: Constant-mesh 5-speed; multiplate wet clutch
Final Drive: Chain
Suspension / Front: KYB® Speed-Sensitive System inverted fork; fully adjustable, 12.2 in travel
Suspension / Rear: KYB® single shock; fully adjustable, 12.4 in travel
Brakes / Front: Hydraulic disc, 270mm
Brakes / Rear: Hydraulic disc, 245mm
Tires / Front: 80/100-21 Bridgestone® M403A
Tires / Rear: 100/90-19 Bridgestone® M404
L x W x H: 85.2 in x 32.5 in x 50.4 in
Seat Height: 38.0 in
Wheelbase: 58.1 in
Rake (Caster Angle): 27.1°
Trail: 4.6 in
Ground Clearance: 12.8 in
Fuel Capacity: 2.0 gal
Wet Weight: 231 lb
Warranty: 30 Day (Limited Factory Warranty)
Color Team Yamaha Blue; White


Team Yamaha Blue
$7,699 MSRP

White
$7,699 MSRP

Credit: YAMAHA MOTOR