The Wienen Motosports / SSI / 7240 / Walsh Yamaha Racing YFZ450R is derived directly from a production model spec and currently the most technologically advanced sport ATV on the market today. It combines a high-tech, quick-revving, titanium-valved, 449cc fuel-injected engine with a lightweight, professional-caliber cast aluminum/steel chassis. Top features include advanced frame, aggressive bodywork, assist-and-slipper clutch and a large 42mm Mikuni throttle body and 12-hole injector fuel injection delivery system. The overall YFZ450R power and chassis combination makes for a proven championship-winning machine time-and-time again.
Yamaha YFZ450R
Bike
| Model | YFZ450R |
| Engine Type | 449cc liquid-cooled DOHC 4-stroke; 5 titanium valves |
| Bore x Stroke | 95.0mm x 63.4mm |
| Compression Ratio | 11.8:1 |
| Fuel Delivery | Yamaha Fuel Injection (YFI), 42mm |
| Ignition | Transistor Controlled Ignition (TCI) |
| Transmission | 5-speed; wet multiplate assist-and-slipper clutch |
Chassis
| Front Suspension | Independent double wishbone w/Kashima coated piggyback shocks |
| Front Travel | 9.8-inch |
| Rear Suspension | Cast aluminum swingarm w/piggyback shock |
| Rear Travel | 11.0-inch |
| Front Brakes | Dual hydraulic disc |
| Rear Brakes | Wave-style hydraulic disc |
| Front Tyres | AT21 x 7-10 Maxxis® |
| Rear Tyres | AT20 x 10-9 Maxxis® |
Dimensions
| L x W x H | 70.7 in x 48.8 in x 41.9 in |
| Seat Height | 31.9 in |
| Wheelbase | 50.0 in |
| Max Ground Clearance | 9.3 in |
| Fuel Capacity | 2.6 gal |
| Wet Weight | 405 lb |