Engine
Chassis
Dimensions
Top Features
Engine
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
TCI: Transistor Controlled Ignition
Transmission
5-speed; wet multiplate assist-and-slipper clutch
Final Drive
O-ring chain
Chassis
Suspension / Front
Independent double wishbone w/Kashima coated piggyback shocks; high/low speed compression, rebound and threaded preload adjustment, 9.8-in travel
Suspension / Rear
Cast aluminum swingarm w/piggyback shock; high/low speed compression, rebound and threaded preload adjustment, 11.0-in travel
Brakes / Front
Dual hydraulic disc
Brakes / Rear
Wave-style hydraulic disc
Tires / Front
AT21 x 7-10 Maxxis®
Tirres / Rear
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
Maximum Ground Clearance
9.3 in
Fuel Capacity
2.6 gal
Wet Weight***
405 lb
Top Features
- Race-Ready Engine
The YFZ450R is 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. The power and chassis combination makes for a championship-winning machine time and time again. - Advanced Frame
The YFZ450R is motocross ready. The weldless frame is designed from lightweight aluminum, with a tension-steel bottom frame that lets the engine sit lower for excellent mass centralization. Suspension components and settings reduce weight while providing light, sharp handling and rider comfort. - Aggressive Bodywork
Bodywork is designed for great ergonomics and rider comfort, with more room to hang off in the corners, and the seat shape is padded in just the right places to improve lap times. Body panels come off easily without tools for service; there’s no need to remove the battery or other components to take the fenders off. - Advanced Cylinder Head
The 449cc engine uses titanium five-valve cylinder head technology designed to deliver abundant power in the mid-range to top end, with more “hit” feeling right off idle. The higher compression ratio further improves overall engine performance. - Fuel Injection
The YFZ450R incorporates Yamaha Fuel Injection for precise fuel delivery. With a big 42mm Mikuni® throttle body and 12-hole injector, this system provides exceptional atomization of the fuel for maximum power. The system also includes ISC (Idle Speed Control) for easy, reliable start-up and warming. - Assist and Slipper Clutch
An assist-and-slipper clutch reduces clutch lever effort for less fatigue while at the same time increasing clutch plate pressure for positive engagement. This clutch system also reduces engine braking effect, which allows faster cornering, particularly when downshifting.