2013 Kawasaki KX450F and KX250F - First Look

New MXers from Team Green.

First Look: 2013 Kawasaki KX450F

First Look: 2013 Kawasaki KX450F

After Ryan Villopoto won back-to-back Supercross championships and last year's outdoor motocross title, Kawasaki could be excused if it sat on its hands and left the KX450F unchanged. Unfortunately for the competition, Kawi couldn't leave well enough alone.

On the $8699 2013 KX450F, the big news is the KYB Pneumatic Spring Fork (PSF), which saves 1.7 pounds in large part by ditching the metal coil springs. Much like a mountain-bike fork, the PSF is tuned using a hand pump (see gallery below) to set air pressure.

Mods to the dohc, four-valve engine include a new intake cam, piston and ignition settings to create a more userfriendly power curve.

Last year, the KX250F got an industry-first dual-injector EFI system. This time around, the $7599 KX gains the three-map ECU from the 450F; it allows riders to choose among three types of power delivery by exchanging jumper plugs on the ECU. Other engine updates include a bump in compression to 13.8:1 and a new resonator-chamber exhaust system.

2013 Kawasaki KX450F

2013 Kawasaki KX450F

2013 Kawasaki KX450F

2013 Kawasaki KX450F

2013 Kawasaki KX450F

2013 Kawasaki KX450F

2013 Kawasaki KX450F: Slim frame design

2013 Kawasaki KX450F: Slim frame design

2013 Kawasaki KX450F: Front fender & number plate

2013 Kawasaki KX450F: Front fender & number plate

2013 Kawasaki KX450F: Front fork air pressure management tool

2013 Kawasaki KX450F: Front fork air pressure management tool

2013 Kawasaki KX450F: Front fork air pressure management tool

2013 Kawasaki KX450F: Front fork air pressure management tool

2013 Kawasaki KX450F: Handle grip & front master cylinder

2013 Kawasaki KX450F: Handle grip & front master cylinder

2013 Kawasaki KX450F: Launch mode switch

2013 Kawasaki KX450F: Launch mode switch

2013 Kawasaki KX450F: Engine cover

2013 Kawasaki KX450F: Engine cover

2013 Kawasaki KX450F: Rear brake

2013 Kawasaki KX450F: Rear brake

2013 Kawasaki KX450F: Silencer

2013 Kawasaki KX450F: Silencer

2013 Kawasaki KX250F

2013 Kawasaki KX250F

2013 Kawasaki KX250F

2013 Kawasaki KX250F

2013 Kawasaki KX250F

2013 Kawasaki KX250F

2013 Kawasaki KX250F: Slim frame design

2013 Kawasaki KX250F: Slim frame design

2013 Kawasaki KX250F: Front fender & number plate

2013 Kawasaki KX250F: Front fender & number plate

2013 Kawasaki KX250F: front master cylinder

2013 Kawasaki KX250F: front master cylinder

2013 Kawasaki KX250F: SFF adjusters

2013 Kawasaki KX250F: SFF adjusters

2013 Kawasaki KX250F: Resonator & engine cover

2013 Kawasaki KX250F: Resonator & engine cover

2013 Kawasaki KX250F: Engine hanger

2013 Kawasaki KX250F: Engine hanger

2013 Kawasaki KX250F: Shroud & tank seat

2013 Kawasaki KX250F: Shroud & tank seat

2013 Kawasaki KX250F: Upstream injector

2013 Kawasaki KX250F: Upstream injector

2013 Kawasaki KX250F: Silencer

2013 Kawasaki KX250F: Silencer