Yamaha’s new WR450F Rightfully Wrong

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D4---Yamaha20151013Last year, Yamaha made clear its intention to move back to the top table of the enduro world with the launch of the eagerly-awaited WR250F. Featuring a completely new engine and chassis, the WR250F achieved an impressive streak of top 5 results – including multiple podium finishes in the 2015 Enduro World Championship – underlining its competitiveness at the very highest level.

For the 2016 season, Yamaha further reinforces its comprehensive off-road line-up with the arrival of the all-new WR450F, a sophisticated enduro racer that benefits from some of the most advanced engine and chassis technology to be seen in its category.

Based on the 2015 MXGP World Championship winning YZ450F – and developed alongside the latest 2016 YZ450F production model – the all-new WR450F utilizes Yamaha’s innovative reverse-cylinder head and rearwards-slanting cylinder. Having convincingly demonstrated its winning performance at the highest level, this industry-leading engine design gives the WR450F rider high levels of controllable and linear torque, while this design’s greater mass centralization contributes towards the bike’s agile handling character.

By adopting the latest YZ-F derived engine layout together with the compact and light-handling YZ-F based chassis, the all-new WR450F delivers major improvements in terms of weight, power characteristics, agility and rideability.

By offering a full range of highly competitive enduro and motocross models for 2016, Yamaha Motor Company underlines its total commitment to all sectors of the off road market.


EASY TO USE POWER
Like the YZ-F models and the recently launched WR250F, the completely new WR450F engine features a reverse cylinder head with a front-facing air intake and rear-exiting exhaust. By increasing intake and exhaust efficiency, this innovative layout enhances the engine’s linear torque feeling, and delivers deep reserves of highly controllable and easy-to-use power.

Dubbed the “Rightfully wrong” concept by Yamaha, the WR450F’s reverse-cylinder head and rearwards-slanting cylinder layout has already proved its competitiveness with the World Championship winning YZ450F motocrosser. As with the highly successful YZ-F “brothers” and the WR250F enduro, the new WR450F’s compact engine layout – together with the underseat fuel tank and snaking exhaust pipe – contributes significantly toward centralization of mass.

Like many innovative technologies, the look of the reverse-cylinder head may initially seem “wrong” to some. But with its inherent performance gains, together with its more focused mass centralization that deliver lighter and more agile handling, this is the right way forward for riders who demand winning performance combined with enhanced rideability.

For effective cooling performance in all riding conditions, the WR450F is fitted with new enduro-specification radiators that feature a different core pitch angle to the YZ-F design, and the new shrouds have also been specially developed to suit the special demands of enduros and long-distance rallies.

To ensure good cooling performance at low speeds, the WR450F is equipped with a radiator fan as standard, a feature that will be appreciated by any rider who has ever been stuck in a bog or been waiting in a long line of riders at a particularly tricky obstacle.

Starting the WR450F on a cold day – or restarting a hot engine – is made easy with the newly-designed electric starter. A new auto-decompressor system cuts in when the electric start is activated for easy starting, and the air supply to the engine can be increased by 40 percent for reliable cold starting. If for any reason the electric starter cannot be used, the WR450F is equipped with a kick-starter.

WIDE-RATIO TRANSMISSION
Equipped with a new wide-ratio five-speed transmission, the WR450F is ready to master any terrain – from slow speed woods riding through to aggressive special tests – as well as being able to achieve a good top speed on open enduro and rally terrain. Compared to the previous WR450F, the new model runs with higher second, third and fourth gears, while first and fifth remain the same.

To complement its wide-ratio transmission this next generation enduro bike features an all-new enduro clutch that’s designed to handle the long and hard days experienced in a typical event. For a light feel together with good durability, the new clutch uses new materials for the friction plates and clutch disc, as well as a newly-added push lever.

The configuration of the new rearwards slanting engine has enabled Yamaha’s designers to construct a compact new chassis that capitalizes on the handling performance gains offered by the engine’s more centralized mass.

Developed from the design used on the latest YZ450F, the aluminum bilateral beam frame runs with sophisticated front and rear suspension systems that deliver light and agile handling performance. The highly versatile and easy to ride character of the new chassis complements the strong and controllable linear torque feeling of the new engine, enabling the WR450F rider to exploit the bike’s full potential.

In the motocross world, the Yamaha YZ450F’s Air-Oil-Separate (AOS) front forks are widely regarded as being amongst the very best designs available today. By keeping the air and oil in separate chambers, these high-tech forks help to prevent cavitation for more stable damping performance and predictable handling characteristics.

Like the latest 2016 YZ-F models, the all-new WR450F is equipped with a 270-millimeter diameter front disc brake that offers excellent stopping performance together with accurate feel.

Featuring black rims, the WR450F’s 18-inch rear wheel and 21-inch front wheel are equipped with Metzeler 6 Days Extreme tire. The enduro equipment also includes a lightweight engine guard, frame-mounted side stand, sealed chain and 22-mm rear axle.

Yamaha’s wide range of Genuine Accessories covers all of the 2016 off road models and includes everything from tools and service parts through to slip-on mufflers and GYTR protectors and engine cases. The range is continually evolving, with the addition of many new items covering current and existing models.

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