KX250 Feature Image

2021 KX250



Strongest 4-Stroke KX250 On The Racetrack

The KX design philosophy - Put mid-level to expert riders on the top step of the podium. Designed to continue the KX250 history of winning – in the extremely competitive 4-stroke 250cc class Kawasaki race machines have the most AMA Supercross and Motocross titles – the 2021 model KX250 builds on the engine changes from the previous year to deliver even greater power and an even higher rev limit, plus electric start and a hydraulic clutch.


  • Fuel-injected 249cm3 liquid-cooled 4-stroke, single cylinder engine.
  • New slim, ergonomic bodywork KX450 styling with long, smooth surfaces and flatter tank-seat line.
  • Revised, KX450-based frame and KX450 Swingarm offer improved handling and increased rear wheel traction.
  • Fitted with a KX450 Hydraulic Clutch offering more direct feel and light lever action for more consistent feeling.
  • Updated Fine-Tuned Suspension and Brake Components for increased bump absorption and traction.
  • Ease of use with Electric Start and lightweight compact Li-ion battery.
  • Holeshot advantage with Launch Control Mode.
  • High performance KYB 48mm dia inverted coil-spring fork (with Kashima Coat) matched to a new KYB shock unit.
  • Factory-style 28.6mm Renthal Aluminium Fatbar reduces vibration and shock transmitted to the rider.

Factory-Style Engine Components and Tuning

Despite the 2020 KX250 already benefitting from a significant power increase thanks to its adoption of finger-follower valve actuation like the KX450, additional changes for 2021 raise peak power even further and enable an even higher rev limit, while significantly increasing low-mid rpm performance. As before, dual injectors, downdraft-style intake, and race inspired tuning and parts add to performance.

More-Race-Winning High-RPM Power

The new engine boasts an increase in peak power of approximately 1.0 kW (1.4 PS), and the rev limit increases a further 350 min-1 to 14,500 min-1. A significantly more robust low-mid range is complemented by strong high-rpm performance that gives riders an advantage on the straights, and, when combined with a higher rev limit, makes it easier to tie corners together for quicker lap times

2021 KLX300R right facing

Factory-Racer Engine Tuning

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 – both contributing to high-rpm performance.

Hydraulic Clutch

Like the KX450, a hydraulic clutch offers direct feel and light lever action. Less play as the clutch heats up during heavy use results in more consistent feeling. The use of coned-disc springs contributes to lighter clutch actuation when the lever has been pulled in, and a wider clutch engagement range, which facilitates control (especially when half-clutching).

Electric Start & Battery

Being able to restart an engine quickly during a race can mean the difference between keeping your lead, or having to fight your way back through the pack. Electric start makes restarting the engine as easy as pushing a button. Lightweight, compact
Li-ion battery helps keep weight to a minimum.

Lightweight Frame

An evolution of the current design, the new frame offers a better overall rigidity balance. While many parts are common with the KX450’s frame, the cast parts (like the shock tower mount and engine hangers) were designed specifically for the needs of the KX250.


Adjusting engine settings to suit conditions is simple with the three DFI couplers. Plug-and-play style system is quick, easy and stress-free. Each of the three maps can be reprogrammed using the optional accessory KX FI Calibration Kit.

  1. MX Hard conditions (default)
  2. MX Standard conditions
  3. MX Soft conditions.

Steering Head & Swingarm update

Steering head area with optimised rigidity, main frame rails with revised cross-sections, and a revised line for the swingarm brackets contribute to the overall rigidity balance. Wider lower frame rails also contribute to overall rigidity balance. KX450 swingarm
delivers the rigidity to match the frame, and contributes to increased rear traction. Chassis balance and settings were all set to suit race-experienced riders.

Race Ready Suspension

High-performance KYB ø48 mm inverted coil-spring fork handles suspension duties up front. Its large-diameter inner tubes enable the use of large ø25 mm damping pistons, delivering smooth action and firm damping. Lower triple-clamp with revised rigidity and revised linkage ratios contribute to increased absorption and damping performance.

Strong Braking Performance

New KX450 front master cylinder adds to the high level of control and feedback from the front brake. A smaller-diameter rear disc ø240 mm offers performance optimised for the KX250. The stylish discs contribute to both sporty looks and a high-quality appearance.

Racer-Friendly Ergonomics

Factory-style ø28.6 mm (1-1/8”) Renthal aluminium Fatbar, a popular aftermarket part, is now a standard feature. The thicker handlebar helps reduce vibration and shocks transmitted to the rider, while the new grip position (19 mm lower, 8 mm 10 closer) helps put the rider in a position that makes it easier to weight the front wheel.

Factory Styling

Complementing the KX250’s sleek new bodywork, factory-style graphics ensure it is the sharpest looking bike in the paddock and further reflect its highly-tuned performance. Coloured highlights on the suspension adjusters and engine oil cap and generator cover plugs contribute to a distinctive Kawasaki look.

Slim, Ergonomic Bodywork

The narrow frame and minimalistic bodywork offer a slim riding position that facilitates control.  A low, flat tank/seat design makes it easier to sit farther forward, and long, smooth surfaces make it easy to slide back and forth.

Adjustable Ergonomics

A choice of four handlebar positions and two footpeg positions allows riders to tailor their riding position to suit body size and preference.

2021 KX250

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KX250 (KX252C)

Engine Type4-stroke, liquid cooled, single cylinder
Displacement249 cm³
Bore x Stroke78.0 x 52.2 mm
Compression Ratio14.1:1
Valve SystemDOHC, 4 valves
Fuel SystemFuel injection: ø44 mm x 1 with dual injectors
IgnitionDigital DC-CDI
Transmission5-speed, return
ClutchWet multi-disc, manual
FramePerimeter, aluminium
Wheel travel - front314 mm
Wheel travel - rear316 mm
Tyre Size-front80/100-21 (51M)
Tyre Size-rear100/90-19 (57M)
Suspension - frontø48 mm inverted telescopic fork with adjustable compression and rebound damping
Suspension - rearNew Uni-Trak with adjustable dual-range (high/low speed) compression damping, adjustable rebound damping and adjustable preload
Brakes - frontSingle semi-floating 270 mm semi-floating petal disc with dual piston caliper.
Brakes - rearSingle 240 mm petal disc with single piston caliper.
L x W x H2,180 x 820 x 1,265 mm
Wheelbase1,485 mm
Ground Clearance335 mm
Seat height950 mm
Fuel capacity6.2 litres
Curb Mass107.5 kg (includes full fuel tank, all fluids at optimum levels)
ColourLime Green
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