Advanced Cylinder Head

The 449cc engine uses titanium five-valve cylinder head technology 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.

Advanced Frame

The YFZ450R SE 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

With more room to hang off in the corners, the bodywork is designed for great ergonomics and rider comfort. The seat shape is padded in just the right places while the body panels come off easily without tools for service, so there’s no need to remove the battery or other components to take the fenders off.

Aggressive SE Style

Aggressive styling gives the YFZ450R SE a racy customized look with extras like the GYTR® front grab bar to match its unique graphics package.

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 for faster cornering, particularly when downshifting.

Fuel Injection

The YFZ450R SE incorporates Yamaha Fuel Injection (YFI) 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.

Race-Ready Engine

The YFZ450R SE 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.

Specification:

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
• Fuel Capacity - 2.6 gal

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®
• Tires/Rear - AT20 x 10-9 Maxxis®