2012 Kawasaki Motocross range

For 2012 Kawasaki has redesigned the KX450F and its little brother, the KX250F, incorporating new technology and numerous changes to chassis, engine and transmission.

The new 2012 KX250F features dual fuel injectors that work in tandem, including one placed inside the airbox. The 2012 KX450F gains a rider-selectable launch control aimed at improving traction, and reducing wheel spin, in first and second gears. The system automatically disengages the first time the rider selects third gear.

2012 KX450F
The KX450F is a premium motocross bike that for 2012 gains numerous factory-inspired features designed to give serious riders an edge on the track.

New for 2012

Engine improvements
The 2012 revisions to the KX450F's piston, cams and exhaust system result in a wider powerband and performance increases at both ends of the rev range. The 4-stroke, liquid cooled DOHC 4-valve engine displaces 449cc with engine compression of 12.5:1.

New Launch Control Mode
Activated at the push of a button in either N, 1st or 2nd gears, the factory style launch control system increases the chance of getting a good start by helping riders maximise traction when starting.

The Launch Control system activates a separate engine map designed to ensure efficient race starts in slippery conditions. The map retards ignition timing, allowing tyres to gain grip in low-traction situations, and allowing riders to focus on their lines. Once the rider shifts into third gear, the system is automatically disengaged, switching back to the normal engine map. This is accomplished without sacrificing any mid-range grunt or straight-line speed.

Easier DFI tuning
A new system allows riders to change DFI settings by simply replacing a coupler located on the right side of the steering stem. Riders can choose between Standard, hard or Soft terrain settings to suit riding conditions. Further tuning options are available using the optional Kawasaki racing software.

New adjustable handlebar position
A choice of four positions allows riders to tailor their riding position. Factory-style Renthal handlebar and pad come standard.

New factory styling
Complementing the Lime Green "flow line" created by the fenders, minimalist shrouds and seat, factory-style graphics, black alumnite rims, black fork guards, blue alumnite finish on the suspension adjusters give the 2012 KX450F the looks to match its highly tuned performance.

There is a slimmer, adjustable cockpit with reduced upper frame rails, smaller and slimmer radiator shrouds and the top of the fuel tank is lowered to create a new straight line design seat.

Revised petal disc brakes
Revised front and rear petal disc brakes offer efficient braking performance. Rigid-mounted front disc offers reduced unsprung weight.

New adjustable footpeg position
On the 2012 KX450F, riders can choose from two footpeg postions to suit body size and preference.

2012 KX250F
The KX250F returns with more usable power, which is accomplished by equipping its Digital Fuel Injection (DFI) system with a second fuel injector located near the airbox intake.

The all-new 'upstream' injector helps build a wider and more potent spread of power as rpm climbs. The two fine-mist atomising injectors that feed the 250cc four-stroke powerplant are distinct in appearance with different body sizes, but deliver the same per-cycle capacity.

Together, Kawasaki's dual injectors pack a one-two punch, delivering a second dose of fuel on acceleration to increase the high-rpm power and over rev capabilities of the KX250F.

While the dual injector system is the central highlight of revisions made to the 2012 KX250F, engineers also introduced a host of subtle changes to the motor to make it stronger and more durable. These include an upgraded crankshaft, which achieves a crankshaft balance factor of nearly 60 percent, which is right on par with factory Kawasaki race machines.

Kawasaki has retained the unique Separate Function Fork, introduced last year, although there are increased spring rates on front and rear suspension aimed at race-level riders. The fork spring rate is higher and a new longer rebound spring improves corner approach and provides a more subtle feel.

In the left fork tube's damper stack, the valving has been adjusted to complement the heavier spring rate. Two key features that retained from last year are the external fork preload adjuster and the trick titanium coating on the outer surface of the inner fork tubes.

The Showa-built shock also receives a stiffer spring rate, advancing from 51N/mm to 53N/mm. Along with a re-valve on the shock body, the compression damping restrictor and piston rod specs have been enhanced to refine the action of the shock. Complementing the shock upgrades is a thinner tie-rod on the suspension linkage with less rigidity, for smooth suspension action and improved traction. These refinements improve rear wheel traction and allow the KX250F to put the power down more effectively, making it easier than ever to grab the holeshot.

The KX250F also receives a new seat and is finished in race proven components such as a Renthal aluminum handlebar and black alumite-coated aluminum wheels that are both lightweight and incredibly strong.

2012 KX65
The 2012 KX65 features a high performance 65cc 2-stroke engine, which has received a number of enhancements. These include exhaust and transfer ports shaped for top-end power, tuned exhaust, thicker O-rings exhaust seals and coated aluminium cylinder walls for improved heat transfer. Other features are digital ECU, 24mm Mikuni carburetor, multi-plate clutch, and 6-speed transmission.

The backbone of the KX65 is a high tensile steel semi-double cradle frame, with removable left side rear frame piece for airbox and shock servicing. There is a 33mm conventional front fork, bottom link uni-trak rear suspension and large 180mm front and rear brake rotors. For 2012 the bike is offered with blue fork caps and new graphics.