More power and electric start for 2021 KX250

2021 Kawasaki KX250

For 2021 Kawasaki’s KX250 gets a new frame and swingarm based on the most recent updates to the KX450 along with further engine improvements that push peak power up by around three per cent and the operational ceiling up by another 350 revs to 14,500 rpm. The KX250 also loses the F suffix from its nomenclature.

The use of coned-disc springs contributes to lighter clutch actuation when the lever has been pulled in, and a wider clutch engagement range

Electric start makes an appearance for the first time on the KX250 and it now also scores the hydraulic clutch set-up from the KX450.

Superbike derived DLC finger-followers are struck by high-lift cams actuate 32 mm intake valves and 26.5 mm exhausts which in-turn are fed by enlarged and reprofiled ports.

Like the KX450, the KX250 features a valve train designed by Kawasaki’s World Superbike engineers. Finger-follower valve actuation enables a higher rev limit and more aggressive cam profiles

The exhaust cam timing is retared by three-degrees which contributes to the increased engine performance and the valve springs are stiffer than the previous model.

A short skirt, reinforced external ribs and the use of a bridged-box bottom, featuring internal bracing, contributes to a light, strong piston design. A dry film lubricant coating on the piston skirts reduces friction

A new piston with a dry film lubricant coating swings off a 3 mm longer connecting rod that helps reduce mechanical losses while the cylinder itself if offset forward by 3mm. The crank is lighter and offers less windage.

The twin-injector set-up continues with the downstream injector timed for response while as revs increase the primary fuelling switches its bias towards the upper injector which is used primarily for top-end power.

Different magneto rotors are available to change the inertia of the engine to suit rider preference and track conditions.

Launch Control Mode gives riders an edge when lining up at the start gate.

The lines of the new KX250 are smoother and the seat line flatter than before.

Revised design for the top of the fuel tank top allows an even flatter progression from the seat to the tank. The flatter design gives the rider greater freedom of movement

The standard settings of the suspension have been refined to better absorb bumps and aid traction.

High-performance Kashima Coat KYB 48 mm inverted coil-spring fork handles suspension duties up front. Large-diameter inner tubes enable the use of 25 mm damping pistons, delivering smooth action and firm damping.

A choice of four handlebar positions and two foot-peg mounts allows riders to personally tailor their riding position to suit body size and preference.

The New Uni Trak rear suspension system mounts the suspension arm below the swingarm, allowing a longer rear suspension stroke. The longer stroke in turn allows more precise rear suspension tuning.

Renthal Fatbars are now standard while a new KX450 derived front master cylinder aids braking power and control. The rear disc rotor is now 10 mm smaller than before.

The KX FI Calibration Kit features the handheld KX FI Calibration Controller, which enables riders to adjust engine characteristics (by rewriting actual data maps) to suit their preference. This convenient tool can be used without a PC, simply by plugging into the engine’s ECU.

Add established features such as the option of an accessory KX Fi calibration kit for ultra-fine tuning in addition to the three easy to interchange “tuning plugs” and the KX250 mounts a strong argument for your dollar.