Winner of the last five-straight world motocross championships, Yamaha’s YZ450 line has achieved the kind of domination reserved for very special packages.
The YZ-F legend was built on the courage to innovate and the determination to win, but what has kept Yamaha’s four-strokes in front is our attention to detail. The ’06 YZ450 was popular among riders all the way from C grade to pro, because of its useable power spread, outstanding agility – and importantly – confidence-inspiring engine reliability.
For 2007, the hallmarks remain, but we have arrived at a more responsive engine thanks to a new carb setting and camshaft lift angle designed to increase low to mid-range punch. And a lighter engine balance weight has not only sharpened throttle response but made directional changes easier thanks to less gyroscopic force from the reduced mass balancer.
A tough new clutch featuring a lighter pull allows easy operation of the
five speed box while a larger diameter titanium exhaust promotes efficient
combustion.
That strong and reliable five valve engine is still housed in a controlled
flex aluminium chassis but a host of tweaks highlights Yamaha’s philosophy
of machine and rider integration resulting in a more tactile bike/rider
relationship as sensations are transmitted more clearly than ever.
The better the rider and machine can understand what each other is saying,
the faster the lap times fall, and the sooner you get to the podium.
| SPECIFICATIONS | |
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| ENGINE/IGNITION/TRANSMISSION | |
| Type | Liquid-cooled, 4-stroke, DOHC, 5-valve, single |
| Displacement - (cc) | 449 |
| Bore Stroke - (mm) | 95 x 63.4 |
| Compression | 12.3:1 |
| Lubrication | Dry sump |
| Fuel Management | FCR MX39 |
| Ignition | CDI |
| Starter | Kick |
| Fueltank - (L) | 7 |
| Oil Capacity - (L) | 1.2 |
| Transmission | 5-speed |
| Final Transmission | Chain drive |
| CHASSIS | |
| Length - (mm) | 2191 |
| Width - (mm) | 825 |
| Height - (mm) | 1306 |
| Seat Height - (mm) | 989 |
| Wheelbase - (mm) | 1494 |
| Clearance - (mm) | 373 |
| Dry Weight - (kg) | 99.8 |
| FRONT END | |
| Suspension Front | Telescopic fork, 300mm travel |
| Tyres Front | 80/100-21 |
| Brakes Front | Single disc, 250mm |
| REAR END | |
| Suspension Rear | Monocross, 310mm travel |
| Tyres Rear | 100/90-19 |
| Brakes Rear | Single disc, 245mm |