Kubpower Products

Kawasaki 2017 KX450F


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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TypeLiquid-cooled, 4-stroke Single
Displacement449 cm³
Bore and Stroke96.0 x 62.1 mm
Compression ratio12.8:1
Valve systemDOHC, 4 valves
Fuel systemFuel injection: ø43 mm x 1 (Keihin)
IgnitionDigital DC-CDI
StartingPrimary kick
LubricationForced lubrication, semi-dry sump
Transmission5-speed, return
Final driveChain
Primary reduction ratio2.727 (60/22)
1st1.750 (28/16)
2nd1.412 (24/17)
3rd1.188 (19/16)
4th1.000 (19/19)
5th0.875 (21/24)
Final reduction ratio3.846 (50/13)
ClutchWet multi-disc, manual
TypePerimeter, aluminium
Wheel travel:
Front305 mm
Rear305 mm
Front80/100-21 51M
Rear120/80-19 63M
Caster (rake)28.0°
Trail125 mm
Steering angle (left/right)42° / 42°
Frontø49 mm inverted telescopic SFF-AIR TAC (Separate Function front Fork Air Triple Air Chamber) with adjustable compression damping and rebound damping
RearNew 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 length2,195 mm
Overall width820 mm
Overall height1,280 mm
Wheelbase1,495 mm
Ground clearance335 mm
Seat height950 mm
Curb mass108.8 kg with full tank of fuel
Fuel capacity6.3 L

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