Light and powerful, the 2017 KX450F provides sharp handling and strong circuit performance that will dominate the 450cc motocross class. Combining the light engine and chassis makes the KX450F the lightest 450cc Kawasaki Motocrosser, while a slim chassis and the powerful engine result in sharp handling and excellent circuit performance.
The enhancements made to the KX450F have maintained the KX design philosophy which stretches back to the creation of the KX brand more than 40 years ago; place mid-level to expert riders on the top step of the podium, every time.
Fuel-injected 449 cm³ liquid-cooled, 4-stroke Single delivers hard-hitting power from low- through high-rpm. The broad powerband and responsive throttle offer a broad spread of torquey response that enables racers to get on the gas and go even from down low. Race-inspired tuning and parts like the high-performance bridged-box bottom piston (a mass-production first when introduced on the 2010 KX450F) ensure top-level performance right out of the box. Introduced in 2016, the offset cylinder and numerous changes to the intake system offer even more power, the exhaust system matches local regulations, and the accessory KX FI Controller enables map calibration without a PC. Like the chassis, the engine benefited from significant weight savings, with the engine group components weighing almost 2 kg less than the previous model!
Intake valves have a flat surface, with a slim throat angle and tight recess (similar to valves on supersport models) contributes to the awesome high-rpm performance. Air cleaner shape and silencer construction ensure that FIM and MA noise regulations are met.
Excess material was trimmed from transmission gears and shafts results in a weight reduction of approximately 260 g when compared to the previous model.
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|Type||Liquid-cooled, 4-stroke Single|
|Bore and Stroke||96.0 x 62.1 mm|
|Valve system||DOHC, 4 valves|
|Fuel system||Fuel injection: ø43 mm x 1 (Keihin)|
|Lubrication||Forced lubrication, semi-dry sump|
|Primary reduction ratio||2.727 (60/22)|
|Final reduction ratio||3.846 (50/13)|
|Clutch||Wet multi-disc, manual|
|Steering angle (left/right)||42° / 42°|
|Front||ø49 mm inverted telescopic SFF-AIR TAC (Separate Function front Fork Air Triple Air Chamber) with adjustable compression damping and rebound damping|
|Rear||New Uni-Trak with adjustble dual-range (high/low-speed) compression damping, adjustable rebound damping and adjustable preload|
|Front:||Single semi-floating ø270 mm petal disc|
|Rear:||Single ø240 mm petal disc|
|Overall length||2,195 mm|
|Overall width||820 mm|
|Overall height||1,280 mm|
|Ground clearance||335 mm|
|Seat height||950 mm|
|Curb mass||108.8 kg with full tank of fuel|
|Fuel capacity||6.3 L|