Already renowned for its enormous power output, the WR450F engine has been thoroughly redesigned to deliver stronger and more controllable performance. The engine is essentially the new generation YZ450F tuned with enduro settings - which means its significantly more compact and lighter than the previous generation engine. The revised configuration enhances the bike's mass centralised design to make it one of the easiest-handling large capacity enduro machines. Featuring increased compression ratio – up from 12.8:1 to 13:1 – the reverse cylinder head also runs a durable forged piston and aggressive cam profiles. New intake/exhaust systems and ECU run WRF specific settings to deliver the best balance of race-winning performance together with ultimate controllability for tight trails
The cylinder head weighs 310g less and is significantly more compact than previous generations. Because this innovative design is positioned close to the bike's mid-section it helps to achieve an idealised mass centralisation, and this contributes enormously towards the WR450F's dynamic handling characteristics. The intake/exhaust valve angles and intake port design are changed and a new piston with a small recess is specified to create a more concave combustion chamber for increased power. This new high-efficiency head with its long and straight inlet, produces a fine balance of power with exceptional controllability.
Engine TypeLiquid-cooled, 4-stroke, DOHC, 4-valve Displacement (cc)450.0 Bore x Stroke (mm)97.0 x 60.8 Compression Ratio13.0 : 1 Lubrication SystemWet sump Fuel ManagementFuel Injection IgnitionTCI Starter SystemElectric Fuel Tank Capacity (L)7.9 Final TransmissionChain TransmissionConstant mesh 5-speed
Frame TypeBilateral beam Suspension FrontTelescopic forks, 310mm travel Suspension RearSwingarm (link suspension), 318mm travel Brakes FrontHydraulic single disc, 270mm Brakes RearHydraulic single disc, 245mm Tyres Front90/90-21 Metzeler Six Days Extreme Tyres Rear130/90-18 Metzeler Six Days Extreme
