All new 2018 Yamaha YZ450F released!

Rebuilt from the ground up with cutting edge technology, including new engine, frame and
bodywork.
Yamaha today unveiled their all-new electric start YZ450F featuring the world’s first smartphone
tuning app on a production motocross bike. Powered by a new reverse-head engine, this completely
restyled YZ450F gives Yamaha riders the power to discover their real potential.
Equipped with the latest cutting edge technology, and delivering outstanding engine power and agile
chassis performance, the new YZ450F connects motocross riders to their bikes like never before, and
will launch Yamaha riders into the victory zone when bikes hit dealers in August. This all-new MXGPbred
motocross bike represents the start of a whole new era of advanced racing technology in which
the rider feels at one with their machine, and where trackside fine-tuning can be done quickly and
easily using the touch screen of a smartphone.
The ideal balance of power and confidence
Yamaha’s designers have set out to build a new kind of motocross bike that delivers the ideal balance
of power and confidence to Yamaha riders, as well as offering class leading style, performance and
handling.
The engine design features an updated cylinder head, piston, cam profiles, cylinder geometry and
more – all working together to deliver class-leading power, with even more controllability. And its new
aluminium bilateral beam frame is designed with an optimized engine mounting position to enhance
the machine’s balance, while also improving cornering feel and increasing overall rigidity.
World’s first production Power Tuner app
Yamaha is also launching today a specifically designed Yamaha Power Tuner smartphone app for
devices running iOS and Android systems – making the 2018 YZ450F the world’s first production
motocross bike with a smartphone-based wireless engine tuner. Now all Yamaha YZ450F riders can
connect with their bike like never before, and dial their engine performance in to suit different riding
styles, track conditions and changing weather.
The Yamaha Power Tuner app enables the rider to make quick and easy fuel and ignition mapping
changes – uploaded wirelessly to the bike via the communication control unit’s onboard Wi-Fi system –
for the ultimate in track-side tuning. A “Log” function allows you to make notes about your riding
location, conditions, bike settings and more – giving you a baseline for future rides – and this groundbreaking
app can also monitor a range of data such as race settings, maintenance and system
diagnostics, engine running time and more.
The new Power Tuner app released with the 2018 YZ450F not only makes it possible to modify engine
mapping in even greater detail than before – it also allows users to share settings among the team or
with friends, thus evolving the system into a unique tool that helps facilitate communication and
enhance Yamaha riders’ performance.
Compact and lightweight electric start – Utilizing a compact starter motor and ultra-lightweight lithium-ion battery, the 2018 YZ450F brings the convenience of push-button starting to the racetrack for effortless restarts under pressure – and more relaxed riding when the clock isn’t ticking. Powered by a high-capacity and ultra-lightweight lithium-ion battery, the system adds minimal weight.

New engine
For 2018 Yamaha has refined the YZ450F’s distinct rearward-slanted cylinder design that features a
unique rear facing exhaust and forward-mounted downdraft intake system.
The all-new cylinder head is lighter, and the engine is repositioned in the new frame at a slightly more
upright angle for optimized front weight distribution. The new engine is equipped with new cam
profiles as well as a new crankshaft and a stronger high-compression “box bridge” piston design with
DLC-coated (Diamond-like-Carbon) pin – and now breathes through a new 44mm Mikuni throttle
body. Together these updates give the rider an ideal balance of 450cc class power with exceptional
control and response.
The transmission and clutch have been overhauled for a more direct connection as well as enhanced
strength. Revised gears with a wider surface area, uprated clutch plates and a stiffer outer pressure
plate all combine to boost durability.
For improved performance and weight distribution the YZ450F’s radiators are larger and angled more
directly in the incoming air stream for improved cooling under the most demanding race conditions.
The innovative wraparound exhaust pipe design improves both mass centralization and power
development, and features revised geometry for 2018. This layout moves the rear end of the exhaust
pipe farther forward and enables a muffler position close to the center of the mass.
Returning for the 2018 model, Yamaha’s Launch Control System (LCS) is integrated into the YZ450F’s
new engine character to deliver quicker, smoother race starts. By boosting controllability when
accelerating hard out of the gate, the LCS gives optimized power delivery and ensures that the rider
has the best chance to grab the holeshot and lead the pack into the first turn.

2018 YZ450F Engine and Electronics

• Main Technical Changes
• New high performance reverse head engine
• New lightweight cylinder head
• New cam profiles and crankshaft
• Power Tuner with new wireless smartphone app
• New lightweight electric starter with lithium-ion battery
• Engine repositioned in frame at a more upright angle
• Stronger high compression piston design with DLC coated pin
• 44mm Mikuni throttle body
• Larger radiators
• More centralized muffler positioning
• New aluminium frame and optimized ergonomics

The YZ450F benefits from a compact new bilateral beam frame that further refines this motocross
bike’s famously instinctive handling. Refined upper frame bracing increases rigidity, while the
redesigned rear frame spars and the new engine mounts improve mass centralization to provide an
ideal balance between cornering feel and straight-line rigidity. Put simply, the new frame is designed
for the best possible balance of bump absorption, stiffness and cornering.
Surrounding this fully rebuilt chassis, the 2018 YZ450F features a new lighter and more compact body
from tip to tail that not only looks sharper, but also gives improved ergonomics for easy rider mobility.

A smaller 6.2 litre fuel tank and redesigned top-mounted airbox together with new concave radiator
shrouds give a slimmer knee grip area that not only improves styling, but offers better knee grip and
enhanced overall riding support for added controllability. And the seat width has been reduced by
9mm and is almost 20mm lower towards the tail end, giving a flatter profile for better rider mobility
during front/rear weight shifting.
Class-leading KYB suspension
The easily tuned, fully adjustable KYB spring-type forks feature speed sensitive damping that
provides exceptional balance between handling and bump absorption for race-winning performance.
Their AOS (air-oil-separate) design is widely regarded as being one of the industry’s leading systems,
giving excellent low speed feel with high-speed stability – and offers the added advantage of being
easy to set up.
The KYB rear shock boasts new damping characteristics to match the new chassis, and is equipped
with a lighter spring for reduced weight – and for consistent damping performance in longer races, the
reservoir capacity has been increased by 30cc.
New graphics and blue rims
The all-new slimline bodywork is highlighted with the use of new graphics, and the new 2018 YZ450F is
also equipped with blue wheel rims that reinforce its factory bike DNA.

2018 YZ450F Chassis and Ergonomics

• Main Technical Changes
• Newly designed high-rigidity bilateral beam frame
• New engine mounts for mass centralization
• Narrower and flatter seat for improved rider manoeuvrability
• Slimmer, more compact body design
• Optimised suspension matching the new frame
• Redesigned KYB rear shock with larger reservoir
• Compact 6.2-litre fuel tank
• New graphics and blue wheel rims

Availability and retail price
The all-new 2018 YZ450F will be available at Yamaha dealers starting in August 2017. Pricing varies per
country. Please contact your local press officer for country specific information.
Connected as One
The 2018 YZ450F raises the bar in the world of motocross machine design by offering the very highest
level of connectivity between the rider and the bike, both in terms of instant tuneability and also
rider/machine unity. You could not be more Connected as One with the YZ450F.
Rest of the 2018 YZ range
For 2018 the YZ250F and YZ 2-stroke models will also feature new graphics as well as new blue wheel
rims.
GH Motorcycles will again be able to supply competition riders with a wide range of GYTR (Genuine
Yamaha Technology Racing) parts for the 2018 YZ450F. Full details will be available on the Yamaha
official website from August 2017.
2017 MX Pro Tour
Yamaha will once again visit various tracks around Europe where customers will be able to test, feel
and gain knowledge about the 2018 YZ range. Complete details will be live on national Yamaha
websites in July.