Features

 

LIGHTER, FASTER 450cc MOTOCROSSER

The KX design philosophy is simple: put midlevel to expert riders on the top step of the podium. This philosophy has not changed since the creation of the KX brand over 40 years ago. With 32 AMA Supercross titles to its credit, the most of any manufacturer, KX has a proven record of powering champions. Significant weight reduction to engine and chassis for 2018 makes the KX450F the lightest machine in its class. The resultant sharper handling is complemented by a slimmer chassis and an even more powerful engine, further increasing its circuit potential.

HARD-HITTING FUEL-INJECTED POWER 

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. For 2016, an offset cylinder and numerous changes to the intake system offer even more power, the new exhaust system is quieter, and a new accessory KX FI Controller enables map calibration without a PC. Like the chassis, the engine benefits from significant weight savings, with the engine group components weighing almost 2 kg less!

Launch Control Mode

The KX450F features a launch control system similar to that on our factory racers. With the simple press of a button, riders can activate a separate engine map designed to ensure efficient race starts in slippery conditions. (The Launch Control Mode map retards ignition timing, allowing tyres to gain grip in low-traction situations, and allowing riders to focus on their lines.)

Advanced race-ready suspension: SFF-Air TAC (Triple Air Chamber)

The KX450F features Showa’s SFF (Separate Function front Fork)-Air TAC (Triple Air Chamber). The works-replica fork is very lightweight and highly rigid, contributing to superior riding stability. With settings chosen for high-level to expert riders, the new fork offers excellent shock absorption performance at high speeds, making it easier for racers to ride faster. Numerous other benefits include.

– high rigidit

– very light weight

– low friction

– reduced heat influence from damping assembly

– precise settings possible merely by changing air pressure

– easy adjustability


 

Specifications


ENGINE



 



 

 

 



Type : Liquid-cooled, 4-stroke Single
Displacement : 449 cm3
Bore and Stroke : 96.0 x 62.1 mm
Compression ratio : 12.8:1
Valve system : DOHC, 4 valves
Fuel system : Fuel injection: φ43 mm x 1
Ignition : Digital DC-CDI
Starting : Primary kick
Lubrication : Forced lubrication, semi-dry sump
Transmission : 5-speed, return
VEHICLE
Frame Type : Perimeter, aluminium
Rake /Trail : 28.2°/126 mm
Tyre : Front: 80/100-21 51M
: Rear: 120/80-19 63M
Wheelbase : 1,495 mm
Ground clearance : 335 mm
Seat height : 950 mm
Curb mass : 108.8 kg
Fuel capacity : 6.3 litres
Overall Dimensions LxWxH : 2,195 x 820 x 1,280 mm
SUSPENSION
Front : 49 mm inverted Separate Function front Fork Air - Triple Air Chamber (SFF-Air TAC). Compression damping: 22-way. Rebound damping: 20-way
Rear : Uni-Trak. Compression damping: 19-way (low-speed), 4-turns or more (high-speed). Rebound damping: 22way. Spring preload: Fully adjustable
BRAKE
Brake Front :Single semi-floating φ270 mm petal disc.
Caliper : Dual-piston
Brake Rear : Single φ240 mm petal disc.
Caliper : Single-piston

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