Kawasaki's 250 and 450 four-stroke motocross bikes will get a thorough overhaul. These bikes and the majority of their off-road models will be offered in optional Monster Energy livery featuring black bodywork and wheels, green hubs, a silver frame and a new graphics set.



The KX450F gets a host of upgrades. including battery less fuel injection, an all-new chassis and updated bodywork. The 250CC single gets changes to the engine, chassis and ergonomics. The liquid-cooled motor's cylinder head gets a new smoother & freer flowing intake port design with new stronger titanium valves and a longer service life. A revised crank web significantly increases crankshaft balance, resulting in reduced engine vibration, smoother power delivery and a noticeable improvement in low rpm throttle response, claims Kawasaki.