WR450F: Enduro racer with reversed engine layout

WR450F: Enduro racer with reversed engine layout

A new WR450F for 2016, with the reversed engine layout as on the YZ450F with which Romain Febvre won the MXGP world championship title in 2015! In this article we explore its benefits.

2016_WR450F_Off road_Reversed engine layout with front-facing straight air intake from 236-656276 (gc_single_col)Reversed engine layout with front-facing straight air intake
2016_WR450F_Off road_Reversed engine with exhaust pipe 'snaking' around the cylinder from 236-656282 (gc_single_col)Reversed engine with exhaust pipe 'snaking' around the cylinder
2016_WR450F_Off road_Front facing air intake with the aircleaner high and dry from 236-656246 (gc_single_col)Front facing air intake with the aircleaner high and dry
 
2016_WR450F_Off road_More engine power and responsive fuel injection from 236-656252 (gc_single_col)More engine power and responsive fuel injection
2016_WR450F_Off road_Power tuner allows to personalize the engine character from 236-656258 (gc_single_col)Power tuner allows to personalize the engine character
Engine: more power and better handling
The engine has the air intake in front and the exhaust to the rear. Why?
-Lightweight parts such as the airbox are located higher and up front. And more out of the way of dirt and debris.
-Heavy engine parts are concentrated in a lower and more central position.
-The fuel sits in a lower and more central place in the frame, so the fuel load has less influence on the handling.
-The air intake tract is straighter, which benefits the high-rpm performance.
-By having the exhaust pipe ‘snake’ around the cylinder, its weight is concentrated around the engine, while it has enough length for good torque.
All in all, this new engine layout with its mass centralisation combined with a YZ-F based, light-handling chassis is a major improvement in agility and rideability!
 
Fuel injection
This potent powerhouse has a stronger feeling all through the rev range, and is considerably more powerful than before. With a bore of 97mm, 4 large titanium valves, 44 mm throttle body, forged piston and offset cylinder layout it revs effortlessly into high rpm ranges. The fuel injection provides excellent starting and running in all kinds of temperature and altitude variations.

Power tuner
Another benefit enabled by the fuel injection, is the accessory Yamaha Power Tuner.
This device allows to personalise the engine character to your own taste or riding style. Or to the specific riding conditions in your area. Also, you can tune the engine to modifications like a different muffler! In an easy way, you can set air/fuel mixture and ignition timing maps, on the spot. And without need for a laptop, which can be a hassle to bring along and use in dusty or wet conditions.


2016_WR450F_Off road_Elaborated, compact and lightweight aluminium frame from 236-656228 (gc_single_col)Elaborated, compact and lightweight aluminium frame
2016_WR450F_Off road_Excellent chassis, suspensions and brakes from 236-656240 (gc_single_col)Excellent chassis, suspensions and brakes
2016_WR450F_Off road_270mm disc brake and high-grade enduro tyres from 236-656216 (gc_single_col)270mm disc brake and high-grade enduro tyres
2016_WR450F_Off road_Enduro specific setup from 236-656234 (gc_single_col)Enduro specific setup
2016_WR450F_Off road_Radiator with cooling fan for extreme conditions from 236-656270 (gc_single_col)Radiator with cooling fan for extreme conditions
2016_WR450F_Off road_Skid plate, sidestand and O-ring chain come standard from 236-656288 (gc_single_col)Skid plate, sidestand and O-ring chain come standard
2016_WR450F_Off road_Tapered handlebar with 4 different mounting positions and indicator for tilting angle from 236-656294 (gc_single_col)Tapered handlebar with 4 different mounting positions and indicator for tilting angle
2016_WR450F_Off road_An enduro racer that's powerful and fun from 236-656222 (gc_single_col)An enduro racer that's powerful and fun
    
Chassis 
The elaborate aluminium main frame construction is compact, has excellent flex characteristics and provides a light and nimble feel for the bike. The narrow knee grip and flat top of the seat allow easy rider movement on the machine. Even the fuel cap is out of the way, for extreme weight shifts in tricky situations. 
 
Suspensions and brakes
High quality KYB ® suspensions are widely regarded as being amongst the very best designs available today. They feature ample setting possibilities. Low-friction coatings help sensitivity, a clear benefit in enduro usage.  The 270mm diameter front disc brake offers excellent stopping performance together with accurate feel.
 
Enduro specific features
There are many differences with the motocross models. The WR450F comes in competition-ready enduro setup! Some examples are:
-Metzeler Six Days Extreme tyres
-18 inch rear wheel
-Push button electric start and automatic decompressor for easy starting, while a kickstarter is still equipped as well.
-Wide-ratio 5-speed gearbox with special enduro clutch, designed to handle a wide variety of use from technical rock climbs and tight forest trails to full throttle stints across open terrain.
-Special enduro radiator with cooling fan.
-Speedometer that includes 2 trip meters, clock, race mode with timer and also fuel and engine lamps.
-Sturdy and light-weight skid plate that protects the engine from stones, tree stumps and mud.
-Aluminium sidestand, light and convenient.
-O-ring chain, more resistant to dirt and requires less maintenance.
-Tapered handlebar that can be mounted in 4 different positions to front or rear - to suit different riders or riding styles.
 
All in all, the WR450F is a modern and competitive enduro racer using our latest motocross technologies. It is designed for both the professional and recreational rider: Powerful, fun to ride, and easy to use. Add the Yamaha famous quality and reliability and you have a package that is hard to beat!


Technical specifications

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YZ450F: smoother power and better handling

2012 WR450F with fuel injection and new chassis

WR-Model History

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