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TOP FEATURES
1. Innovative Hare Scramble/GNCC® Engine Design
The YZ450FX™ shares the revolutionary rearward-slanted-cylinder design of the YZ450F™ that allows for a straight downdraft intake with a symmetrical port layout. In the YZ450FX, this engine delivers a controllable, torquey power character with strong top-end power tuned specifically for cross-country racing.

2. Bilateral Beam Aluminum Frame
A nearly identical bilateral beam frame that is found on the championship winning YZ450F is used on the YZ450FX. It places the engine, fuel tank and exhaust close to the center mass of the bike for extremely light and nimble handling character.

3. Advanced Fuel Injection
The YZ450F-based Keihin® 44mm throttle body fuel injection system is tuned for cross-country racing and ensures smooth throttle response and easy starting in nearly all conditions.

4. Cross Country-Specific Suspension
Industry-leading, YZ450F-derived KYB® spring-type forks with speed sensitive damping and a linkage-type, KYB® rear shock both feature fully adjustable settings designed specifically for cross country racing.

5. Cross Country Podium Ready
With a two gallon fuel tank, sealed O-ring chain, and an 18-inch rear wheel with XC racing tires, the YZ450FX is ready to win right out of the box.

6. Electric Starter System
The YZ450FX features an electric starter to help reduce rider fatigue along with a new main switch-free electrical system for easier starting off.

FEATURES & BENEFITS

NEW FOR 2017:
Revised Suspension Systems
Both front and rear dampers feature optimized settings for 2017 to further boost overall suspension performance, while the front fork utilizes a stronger oil seal system for enhanced durability in the toughest conditions.

Simplified Servicing
Redesigned air cleaner cover provides tool-less access to the air filter, positioned at the front of the bike to avoid roost from the rear wheel.

Updated Indicators
Thanks to a new WR-style fuel level sensor in the tank, the 2017 YZ450FX includes convenient fuel level and engine warning indicators on the handlebar.

ENGINE
Cross Country-Tuned YZ450F Power
YZ450F-style 449cc liquid-cooled DOHC four-stroke, with forward positioned straight intake, delivers massive power specifically tuned for cross country racing, to challenge for race victories in the very competitive GNCC® and Hare Scrambles race series.

Innovative Engine Design
The position of the engine moves the rotational mass of the cams towards the center of the bike which allows for a straight shot, downdraft intake and straight exhaust port for ultimate performance. This also keeps the airbox up high, out of dust and mud/water.

Wraparound Rear Positioned Exhaust Layout
Lightweight YZ450F-spec exhaust system maximizes engine power while centralizing mass, thanks to the innovative wrap-around header design.

Advanced Fuel Injection
The fuel injection system uses 3D mapped electronic control for the fuel and ignition timing that are optimized for cross-country racing, with a YZ450F-based 44mm throttle body.

Wide Ratio Gearing
A five-speed wide-ratio transmission is used to insure the right gear is selected for a wide variety of terrain found in cross country racing, from tight single tracks to wide-open desert blasts.

FX-Specific Clutch System
Based on the YZ450F, the clutch plate material, springs, push lever and oil valve are optimized for cross-country racing.
YZ-F-Derived Cooling System
Large-capacity YZ450F radiators provide maximum cooling efficiency with great strength, and can be fitted with an accessory cooling fan for additional airflow at slower speeds.

Electric Starter System
Push button electric start makes starting the YZ450FX easy and convenient, complete with a simplified electrical system.

CHASSIS/SUSPENSION
Bilateral Beam Aluminum Frame
YZ450F-based frame offers a compact size while optimizing mass centralization. With its extensively tested assembly of aluminum forgings and extrusions complete with model-specific engine mounting, the FX frame retains legendary Yamaha handling and response.

Advanced YZ450F Front Fork
Fully adjustable YZ450F-based KYB® spring-type fork with speed sensitive damping delivers precise, fade-free handling.

Revised Shock Tuning
The rear linkage and KYB® shock provides 11.6 inches of travel with adjusters for high- and low-speed compression damping, rebound and spring preload—and features a large piggyback reservoir for excellent damping and fade resistance.

270mm Front Brake
270mm front brake system provides exceptional stopping power and braking control.

GNCC®-Specific Tires and Wheels
Lightweight 21-inch front and 18-inch rear rims provide exceptional durability with enduro-specific tires.

ADDITIONAL FEATURES
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 race conditions in a matter of seconds with the push of a few buttons.

Real World Tough Features
Rugged plastic skid plate, quick-adjust clutch, aluminum handlebars and a side stand are standard for added rider convenience.
Sealed O-ring Chain
High quality O-ring chain is tough and durable.

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

SPECIFICATIONS
Engine Type: 449cc liquid-cooled DOHC 4-stroke; 4 titanium valves
Bore x Stroke: 97.0mm x 60.8mm
Compression Ratio: 12.5:1
Fuel Delivery: Keihin® fuel injection, 44mm
Ignition: TCI - Transistor Controlled Ignition
Transmission: Wide-ratio constant-mesh 5-speed; multiplate wet clutch
Final Drive: O-ring chain
Suspension / Front: KYB® spring-type fork with speed sensitive damping; fully adjustable, 12.2-in wheel travel
Suspension / Rear: KYB® single shock; full adjustable; 12.5-in wheel travel
Brakes / Front: Hydraulic disc, 270mm
Brakes / Rear: Hydraulic disc, 245mm
Tires / Front: 90/90-21 Dunlop® AT81F
Tires / Rear: 120/90-18 Dunlop® AT81
L x W x H: 85.2 in x 32.5 in x 50.4 in
Seat Height: 38.0 in
Wheelbase: 57.7 in
Rake (Caster Angle): 26.3°
Trail: 4.5 in
Ground Clearance: 12.8 in
Fuel Capacity: 2.0 gal
Wet Weight: 262 lb
Warranty: 30 Day (Limited Factory Warranty)
Color: Team Yamaha Blue
MSRP: $8,999

Manufacturer's Suggested Retail Price (MSRP) shown. Does not include tax, title, prep or destination charges. Actual prices set by dealer.

*** Wet weight includes the vehicle with all standard equipment and all fluids, including oil, coolant (as applicable) and a full tank of fuel. It does not include the weight of options or accessories. Wet weight is useful in making real-world comparisons with other models.

Specifications subject to change without notice. This document contains many of Yamaha's valuable trademarks. It may also contain trademarks belonging to other companies. Any references to other companies or their products are for identification purposes only, and are not intended to be an endorsement. © 2016 Yamaha Motor Corporation, U.S.A. All rights reserved.

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Credit
Yamaha
First Look: 2017 Yamaha Motocross and Off-Road Line
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