All-New from the ground up, the YZ450F incorporates electric start, exclusive smartphone app power tuner, new engine, new frame, new slim styling and revised settings to the already industry-best suspension. The 2018 Yamaha YZ450F is unquestionably one of the most highly anticipated bikes of the year. The blue machine is all-new for 2018 and features a number of major changes to the engine, chassis, and bodywork. ... Another change made to the engine is the new 44mm Mikuni throttle body that replaces the previous Keihn unit
All-New Machine for 2018
With an all-new engine, new frame, new bodywork and more, the 2018 YZ450F™ is ready to take the MX open class to a whole new level. So pick your view for 2018: behind the handlebar of YZ450F, or well behind the rear fender.
All-New Power Tuner App
Yamaha breaks new ground with the new Power Tuner app, putting the flexibility and precision tunability of the GYTR® Power Tuner into your smartphone. Make fueling and ignition timing changes instantly and upload them to the bike via the onboard WiFi system for the ultimate in track-side tuning.
Electric Starter System
Utilizing a compact starter motor and ultra-lightweight lithium battery, the YZ450F brings the convenience of push-button starting to the racetrack, for effortless restarts under pressure, and relaxed riding when the clock isn’t ticking.
An updated cylinder head, piston, cam profiles, cylinder geometry and much more work together to give YZ450F riders the best balance of open-class power with controllability.
Yamaha’s bilateral beam frame features new main spars, engine mounts and engine mounting position to further centralize mass and provide an ideal balance between cornering feel and straight-line rigidity.
Yamaha continues to use spring-type forks with refined, speed-sensitive damping to give industry-leading suspension performance straight out of the box. 2018 brings updated settings to match the updated frame and engine layout.
Engine Type 449cc liquid-cooled DOHC 4-stroke; 4 titanium valves
Bore x Stroke: 97.0mm × 60.8mm
Compression Ratio: 12.8:1
Fuel Delivery: Mikuni® fuel injection, 44mm
Ignition: TCI: Transistor Controlled Ignition
Transmission: Constant-mesh 5-speed; multiplate wet clutch
Final Drive: Chain
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