2021 Yamaha YZ450F

• New Monster Energy Yamaha Racing Edition option
• Wireless smartphone-based Power Tuner app
• Revolutionary reversed engine design with front-mounted FI system and rear-exiting exhaust
• Mass centralizing rearward-slanted cylinder helps keeps weight centred in the chassis
• Electric starting and lithium ion battery
• Launch Control System
• Compact aluminum bilateral beam frame and aluminum swingarm
• Industry-leading, race-ready, fully adjustable suspension
• Handlebar-mounted fuel map selector switch

More Compact Rearward-Slanted Cylinder 
The YZ450F’s distinct rearward-slanted cylinder light and compact design are ideally positioned in the frame for optimized weight distribution. Inside, the head features steep valve angles to allow for an even straighter down-draft intake port, as well as more aggressive cam profiles and larger diameter exhaust header joint that work together with a higher compression bridge-box design piston, DLC-coated piston pin, and longer connecting rod to give YZ450F riders the best balance of class-leading power with an outstanding level of control.

Yamaha Power Tuner App 
The free of charge and industry-exclusive Yamaha-created Power Tuner app brings the power of the GYTR Power Tuner to your iOS® or Android® device. Using wireless connectivity to talk to the bike’s onboard CAN-bus network, the app allows owners to adjust air/fuel mixture and ignition timing maps to tune engine performance for track conditions, record race log information and monitor a range of data such as maintenance and system diagnosis, engine run time and more.

Adjustable Fuel Mapping 
A handlebar-mounted map switch allows the rider to quickly select between preloaded engine maps—loaded and configured in the Power Tuner app—to account for changing track and weather conditions.

Electric Starter System 
The YZ450F features a compact electric starter system to minimize restart delays on track and add convenience everywhere else. Powered by a high-capacity and ultra-lightweight four-cell lithium-ion battery, the system adds minimal weight.

Launch Control System (LCS) 
LCS optimizes engine output for quicker, smoother race starts every time by boosting controllability out of the gate and ensuring the rider has the best chance to get the holeshot and lead the competition into the first turn.

Advanced Fuel Injection 
The engine breathes through a 44 mm Mikuni® throttle body that is fed by a high pressure electric pump to ensure optimum fuel atomization and power for a wide range of riding conditions. The ultra-compact throttle body also saves weight for excellent mass-centralization.

Cooling System 
The YZ450F features radiators that are angled directly in the incoming air stream for enhanced cooling, even under the most demanding race conditions.

Robust Transmission and Clutch 
The YZ450F’s transmission gears use a wide surface area that is balanced against updated clutch components. All designed to boost durability, the shift drum and selectors improve feel with a shorter, more direct stroke when changing gears, too.

Wraparound Rear-Positioned Exhaust 
Yamaha's innovative exhaust pipe design enhances mass centralization by moving the rear end of the exhaust pipe farther forward and enabling the muffler's position closer to the machine's centre of the mass. Thanks to a wider joint profile, power development is enhanced, too.