Hyper Racer - Copyright © 2009 - Dean Crooke


450cc Yamaha 4-stroke

There’s nothing like the full-blooded, red-meat-and-three-veg thrust of a big-bore engine like the WR450F to get that adrenalin pumping.

The second thing you’ll notice about the WR450F (the first being a slight blurring in the periphery of your vision), is just how tractable and controllable our engineers have managed to make a big horsepower engine.

The WR450F is a rock-solid reliable, five-titanium-valved engine. With 449cc of liquid-cooled DOHC four-stroke and five titanium valves delivering broader power than ever, high over-rev capacity and crisp, linear throttle response, there’s not much that can stand in your way. Special camshafts, carburation and intake ports all work together to produce an engine with mind-boggling low- and midrange power and a bullet-proof reputation..


449cc five titanium valved engine delivers more broad power than ever, with special WR camshafts, carburation, intake ports, exhaust, etc., all working together for mind-boggling low- and midrange power.

Special crank balance factor and AC generator provide super-smooth running. A piston oil-jet provides increased cooling for long life.

Dry-sump lubrication system carries the oil reservoir inside the engine cases, for excellent mass centralization and simplified plumbing.

Vortex CDI ignition system delivers more precise spark and monitors engine speed to ensure optimal timing for fast, strong response during hard acceleration.

Highly evolved five-titanium-valved engine starts with the push of a button.

Engine Type Liquid cooled 4-stroke, DOHC, 5-valve
Displacement 449 cc
Bore x Stroke 95.0 x 63.4 mm
Compression Ratio 12.3 : 1
Lubrication System Dry sump
Fuel Management FCR MX41
Ignition Vortex CDI
Starter System Electric
Oil Capacity 1.2 L
Final Transmission Chain drive
Transmission 5-speed