Official Yamaha Off-Road Centre
The fabulous WR450F
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LIQUID-COOLED, 4-STROKE, SINGLE-CYLINDER, 5-VALVE, 449CC ENGINE
In the enduro and trail world the WR450F’s liquid-cooled 4-stroke engine has achieved legendary status for its durability and reliability. With its 5-valve cylinder head and new fuel injection system, this powerplant pushes out strong, useable and linear performance hour after hour.
NEW FUEL INJECTION SYSTEM
The WR450F benefits from a compact new fuel injection system which makes for enhanced engine performance. By monitoring sensors which detect throttle position, intake temperature, air pressure, crank rpm and coolant temperature, the ECU is able to constantly adjust fuel volume and ignition timing to achieve optimal engine efficiency.
YAMAHA COMPETITION KIT
A Competition Kit is included which is aimed at riders who use the WR450F on closed courses. The kit includes a resonator exhaust system, as well as a 13/50 sprocket set and number of other performance parts. There’s also an optional Power Tuner system which allows riders to adjust the engine performance to suit varying conditions.
NEW ALL-ALUMINIUM BILATERAL BEAM FRAME
Unlike some conventional designs, the WR450F’s new bilateral beam frame is manufactured from a unique combination of forged, extruded and panel aluminium parts which are welded together to create a unit offering an idealised balance of rigidity. This gives excellent rider feedback combined with superior handling performance.
250-CLASS DIMENSIONS
The new lightweight chassis has been developed directly from Yamaha’s MXGP-winning YZ250F. Featuring a short 1,475mm wheelbase and compact dimensions, this new 250-class design gives quicker turning and improved agility – and its special bilateral design allows the relocation of the fuel tank and radiators for a greater centralisation of mass.
ADVANCED CHASSIS SPECIFICATION
With its new fuel injected engine and compact chassis, the WR450F adds an exciting new dimension to the E2 class. Complementing the new bilateral beam frame is a slimline 7.2 litre fuel tank with YZF-type sidepanels, as well as a lower 960mm high seat. And with black Excel wheel rims and Pro-Taper handlebars, the WR450F is ready for action.
Technical specification
| WR450F Engine | |
|---|---|
| Engine type | liquid-cooled, 4-stroke, DOHC, 5-valves |
| Displacement | 449cc |
| Bore x stroke | 95.0 mm x 63.4 mm |
| Compression ratio | 12.3 : 1 |
| Lubrication system | Dry sump |
| Fuel system | Fuel Injection |
| Clutch type | Wet, Multiple Disc |
| Ignition system | CDI |
| Starter system | Electric and kick |
| Transmission system | Constant Mesh, 5-speed |
| Final transmission | Chain |
| Chassis | |
|---|---|
| Frame | Aluminium Bilateral Beam |
| Front suspension system | Upside-down telescopic fork |
| Front travel | 300 mm |
| Caster angle | 27º |
| Trail | 115 mm |
| Rear suspension system | Swingarm, (link suspension) |
| Rear travel | 305 mm |
| Front brake | Hydraulic single disc, Ø 250 mm |
| Rear brake | Single Disc, Ø 245 mm |
| Front tyre | 80/100-21 51P |
| Rear tyre | 120/90-18 65P |
| Dimensions | |
|---|---|
| Overall length | 2,315 mm |
| Overall width | 825 mm |
| Overall height | 1,275 mm |
| Seat height | 960 mm |
| Wheel base | 1,475 mm |
| Minimum ground clearance | 335 mm |
| Wet weight (including full oil and fuel tank) | 129 kg |
| Fuel tank capacity | 7.2 litres |
| Oil tank capacity | 1.2 litres |