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Yamaha YFZ450R


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.


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


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®


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