 
Motocross-winning technology for Yamaha’s 250cc
enduro bike
Yamaha’s WR250F and WR450F enduro bikes feature some of the smartest
technology in the off road world, including a unique reversed cylinder head
engine design as well as the pioneering Power Tuner smartphone app that
offers fast and easy trackside tuning.
The forward-facing intake and rear-exit exhaust creates a reversed layout
that not only gives greater inlet efficiency for stronger engine performance
– it also helps to achieve a high level of mass centralization by locating
the air intake in front of the bike, with the fuel tank positioned in the
centre. The use of a rearward-slanted cylinder and wraparound exhaust also
helps to centralize weight, giving extremely agile handling and lightweight
manoeuvrability.
As well as their powerful and tractable engines, the WR250F and WR450F
enduro bikes also benefit from an industry-leading chassis design that
utilizes a lightweight aluminium bilateral beam chassis with best-in-class
KYB speed sensitive front forks and a link-type rear end that delivers
precise and stable handling on the most hostile and challenging terrain.
For 2022 the WR250F has undergone a major engine and chassis upgrade with
advanced technology from the bike that has dominated the 250cc motocross
class in 2021.
So far this year the YZ250F has won both the East and West AMA 250
Supercross titles, and has taken an impressive number of victories in the
MX2 World Championship and the AMA 250MX National Championship. With a more
powerful engine that delivers stronger performance across the rpm range,
together with a revised frame with rebalanced rigidity levels and a more
powerful braking system, the new WR250F has the ability to succeed at every
level.
New WR250F: Faster and sharper
In the enduro world the WR250F is already one of the most competitive and
useable bikes in its class. Its wide spread of torque makes it the kind of
motorcycle that brings out the best performance in every rider – whatever
their riding skill and off road experience. And its winning technology is
backed up by Yamaha’s premium quality and legendary reliability.
Stronger engine performance
The 2022 WR250F is equipped with a higher specification liquid-cooled
4-stroke electric-start engine that has been substantially uprated by the
adoption of many of the power-boosting features seen on the current
championship-winning YZ250F.
 A
new YZ250F-type cylinder head is one of the key components that gives the
2022 WR250F much stronger mid to top-end performance for even faster special
test times. The engine’s front-facing inlet also incorporates new ducting,
and together with a wider YZ250F-type intake port this new design gives a
superior intake flow rate for higher combustion efficiency and increased
power across the rpm range.
The new head is also fitted with a redesigned exhaust camshaft for
improved low to mid-range power. New ECU settings are designed to optimize
the new engine’s useability at all speeds, and for all-day comfort there’s
a redesigned balancer as well as a new shift cam that gives smoother and
easier gearshifting. The wraparound header pipe features a new heat guard
that prevents snagging – and there’s also a stronger bracket on the
short muffler.
A key asset available to WR250F riders is the Power Tuner app that
enables wireless engine tuning using a smartphone. This innovative
technology makes it easy to adjust the engine power character to suit
different terrains and changing surface conditions – and a
handlebar-mounted switch makes it possible for the rider to select between 2
uploaded engine mappings for on-the-fly power adjustments.
Revised frame rigidity
For the 2022 race season the WR250F’s lightweight aluminium bilateral beam
frame also features the latest technology from the winning YZ250F.
Manufactured using Yamaha’s advanced CF die-casting technique that enables
the use of walls of varying thicknesses, the frame features a revised
balance of rigidity to match the higher performance of the new engine.
By adjusting the flex of the frame in specific locations – and fitting
new tuned-rigidity engine mounts – Yamaha’s engineers are able to create
an incredibly strong chassis that also delivers excellent levels of
feedback, giving the rider a more connected feeling with the track surface.
Race-winning KYB suspension
Yamaha’s industry-leading KYB front forks with their best-in-class speed
sensitive damping system are further refined for 2022 with a range of
modifications that give even better feeling handling and steering. New
damping settings match the revised rigidity of the new chassis, and a
redesigned top triple clamp, handlebar clamps, footpegs and front axle
further refine the ride quality.
The link type rear end has also been uprated with revised damping
settings on the KYB shock to make the WR250’s suspension system one of the
best original equipment packages in the enduro world.
Higher performance YZ250F-type front brake
Braking power is just as important as engine power, and the 2022 WR250F is
equipped with a lighter and more powerful front brake set up from the MX2
GP-winning YZ250F.
This more advanced design uses a 30% more rigid front caliper that’s
equipped with larger diameter 25.4mm pistons and a new 270mm front disc. New
brake pads have a 25% greater surface area than the previous system, giving
powerful and highly controllable braking performance that can shave precious
seconds off crucial test times.
New multi-function meter
During a long and hard day’s riding the compact and lightweight new
multi-meter keeps the rider informed with a range of information. In
standard mode the meter displays the speedometer, clock, timer and two
tripmeters – and in race mode the display shows the key information needed
during an enduro such as average speed, timer and trip functionality. There’s
also an accumulated fuel consumption meter indicator as well as fuel and
engine warning lights.
New graphics
New 2022 graphics reflect Yamaha’s VictorYZone racing pedigree, and
incorporate Icon Blue and dark blue in-mould graphics that provide excellent
durability and scratch resistance to keep them looking good.
WR250F New features
New YZ250F type cylinder head
New YZ250F specification exhaust camshaft
New YZ250F shape intake port
New YZ250F type intake joint
Improved camchain tensioner design
Redesigned engine balancer
New gearbox shift cam
New CF-die cast aluminium Deltabox frame
New engine brackets with WR-specific rigidity levels
Industry leading KYB speed sensitive forks with revised damping settings
New top triple clamp with redesigned handlebar clamps
New YZ250F type footrests, handlebars and front axle
New multi-function meter
Stronger chain guide bracket
New 270mm front disc with 16% larger surface area
New more rigid front brake caliper with larger pistons
New front brake pads giving 25% more contact area with disc
New exhaust heat guard
New stronger muffler bracket
WR250F Other Technical Highlights
250cc liquid-cooled 4-stroke DOHC engine
Reversed cylinder head with forward facing inlet
Yamaha Power Tuner for smartphone engine tuning
Electric start
Radiator cooling fan
Excellent mass centralization for lightweight handling
Wide-ratio 6-speed enduro-specific transmission
Light feeling clutch with quick-adjuster
Compact and lightweight aluminium Deltabox frame
Industry-leading KYB speed sensitive damping coil spring front forks
Link-type rear suspension
KYB shock with high capacity reservoir
4-position rubber-mounted adjustable handlebars
Handlebar-mounted dual mode engine mapping switch
7.9 litre fuel tank
Lightweight resin skid plate
Icon Blue bodywork
Blue wheel rims
In mould graphics
Flat and slim seat
O-ring chain
High-mounted aluminium sidestand
2022 WR450F
Completely redesigned for the 2021 season, the WR450F is one of the
quickest, toughest and most advanced bikes in its class. Like the uprated
WR250F, the WR450F benefits from a wide range of winning technology from its
MX sibling.
High-tech reversed cylinder head engine
The WR450F’s compact and lightweight 450cc powerplant features Yamaha’s
signature reversed cylinder head design that brings with it a whole range of
advantages, such as increased intake efficiency – and idealized mass
centralization that contributes towards the bike’s agile handling feeling,
while the tough 5-speed transmission and heavy duty clutch are ready to
deliver smooth and reliable shifting even during the most severe conditions.
And the user-friendly Power Tuner gives increased versatilty by enabling
engine settings to be amended quickly and easily to suit virtually any
conditions.
Lightweight aluminium beam frame
The WR450F’s lightweight aluminium bilateral beam frame is manufactured
using Yamaha’s unique CF (Controlled Fill) technology that enables the use
of walls of varying thicknesses to give a finely tuned balance of rigidity
– ideal for enduro, where accurate feel and precise feedback are crucial.
Best-in-class suspension
Suspension is amongst the best in class, and features the highly acclaimed
KYB forks with the speed sensitive system that gives superior
controllability in low and high speed riding – and the link type rear end
features a specially tuned KYB rear shock. Both front and rear run with
enduro-specific settings for effective bump absorption across a wide range
of speeds and over different types of terrain.
The WR450F’s braking features the same system as the 2022 WR250F, with
a 270mm front disc and a lightweight large-piston caliper giving outstanding
stopping power together with accurate feel.
A compact and lightweight multi-function display features an odometer,
two tripmeters, clock, timer/stopwatch – and a useful fuel consumption
indicator enables riders and teams to plan fuel stops more accurately.
Icon Blue finish
Finished in Yamaha’s dynamic Icon Blue with in-mould graphics, the
WR450F is one of the most impressive and best-equipped bikes in the 450cc
class.
2022 WR450F Technical Highlights
450cc liquid-cooled 4-stroke DOHC engine
Reversed cylinder head with forward facing inlet
Yamaha Power Tuner for smartphone engine tuning
Compact instrumentation with fuel consumption indicator
Electric start
Large capacity radiators with cooling fan
Excellent mass centralization for lightweight handling
Wide-ratio 5-speed enduro-specific transmission
Durable heat-resistant clutch with quick-adjuster
Compact and lightweight aluminium Deltabox frame
Industry-leading KYB speed sensitive damping front forks
Link type rear suspension
KYB shock with high capacity reservoir
4-position rubber-mounted adjustable handlebars
Handlebar-mounted dual mode engine mapping switch
7.9 litre fuel tank
Lightweight resin skid plate
Icon Blue bodywork
Blue wheel rims
In mould graphics
Flat and slim seat
O-ring chain
High-mounted aluminium sidestand
WR250F and WR450F colours, availability and price
The WR250F and WR450F will be available in Icon Blue with new graphics.
Deliveries to European Yamaha dealers will commence from October 2021.
Prices vary per region, so please contact the national Yamaha distributor
for full information.
Yamaha Genuine Accessories and Off Road apparel
Yamaha offer a wide choice of parts and accessories for the WRF enduro
models, and the constantly evolving range includes everything from
consumables such as air filters and wheel bearing kits through to items that
include anodized covers, folding front brake levers and wheel spacers that
give the bike more individuality.
There is also a wide selection of riding and causal gear aimed at WRF
owners, and includes Yamaha-branded jerseys, pants, socks and gloves, as
well as armour, enduro riding jacket, body warmers, caps and T-shirts.
Features
and Technical Specifications
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