Kawasaki KX250: review, history, specs

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Kawasaki KX250
Manufacturer
Production 78-07
Class Motorcross
Engine
250
Spark Plug B9EV '78-82
B8EG '83-85
B9EG '86-91
R6254E-9 '92-96
BR8EIX '04
BR8ECM '05-07
BR8EVX '97-03 [1]
Front Tire 3.00-21 '78-81 , '82
90/90-21 '83-85
80/100-21 '87-07
80/100-18 '86
Rear Tire 110/90-19 '89-07
130/80-18 '83-85
6705 '78-82
110/100-18 '86-88
Weight
Related KX60
Kawasaki KX80
KX100
KX125
KX250
KX500
Competition Honda CR250R
Suzuki RM250
Yamaha YZ250
Manuals File:1997 Kawasaki KX125, 250, 500 owners manual.pdf

Brochures · Reviews ·

The Kawasaki KX250 was a 250cc, off-road motorcycle and motocross motorcycle manufactured by Kawasaki from 1974 through 1976 and again from 1978 through 2007.

Kawasaki did not produce production motocross machines for the 1977 model year, as their previous version had been proven obsolete by the introduction of long-travel suspension by Kawasaki's competitors, most notably the Suzuki RM250A. Kawasaki returned in 1978 with a limited production and totally revised KX240A-4. The 1980 KX models were the first to use a modern single-shock rear suspension. Water-cooling and front disk brake were instituted with the 1982 models.


History[edit]

The KX250 introduced in 1974 was Kawasaki's first serious attempt at a production motorcross bike. This differed from their earlier efforts in that it wasn't an offshoot of a mainly enduro themed machine. It began a line of production motocrossers that are highly respected for their strength and competitiveness. Kawasaki has always followed a route of continuous development for their KX series lending them to always be competitive and for the speed at which factory racing developments make it into the production machines.

The first KX250 was based largely on Jimmy Weinert's 1973 machine.


Engine[edit]

The engine was a liquid cooled single cylinder, four-stroke. A 77.0mm bore x 53.6mm stroke result in a displacement of just 249.0 cubic centimeters. Fuel was supplied via a double overhead cams/twin cam (dohc).

Drive[edit]

The bike has a 5-speed transmission. Power was moderated via the wet multi-disc, manual.

Chassis[edit]

It came with a 80/100-21 front tire and a 100/90-19 rear tire. Stopping was achieved via single disc in the front and a single disc in the rear. The front suspension was a inverted telescopic separate function front fork (sff) type 2, 22-way compression damping, 20-way rebound damping and 40-way spring preload adustability while the rear was equipped with a uni-trak with adjustable dual-range (2 turns high speed / 19-way low-speed) compression damping, adjustable 22-way rebound damping and fully adjustable spring preload. The KX250 was fitted with a 1.66 Gallon (6.30 Liters) fuel tank. The bike weighed just 203.93 pounds (92.5 Kg). The wheelbase was 58.19 inches (1478 mm) long.

First Generation[edit]

1974[edit]


1975 KX250A[edit]


Small cylinder bore increase to 70mm, electrofused cylinder walls, sealed nitrogen filled rear shock absorbers with long travel. New front hub design.

1976[edit]

KX250A3

  • Only 1600 made

1978[edit]

KX250A4 Featured gold-anodized aluminum swingarm and wheel rims. 70 x 64.9mm engine featuring reed valve induction and a 7.6:1 compression ratio. Mikuni VM38SS carburetor. Maximum power of 40bhp @ 8,000 RPM. Kayaba front forks. remote reservoir rear shocks with 9in of wheel travel.

1979 KX250A5[edit]


Total redesign including frame and a new plastic tank. Offered 11in of wheel travel.

Second Generation[edit]

1980 KX250A6[edit]

KX250A6 First Uni-Trak 250.

1981 KX250B1[edit]

KX250B1

Also Kawasaki introduced a derivative of the KX250 in the form of the KDX250A.

1982 KX250B2[edit]

1982 Kawasaki KX250


Power increased to 42.5 bhp @ 7,500RPM. Featured a 220mm front disk brake.

2005 Kawasaki KX250F[edit]

The 2004 Kawasaki KX250F is a 4-stroke motocross motorcyle loaded with a no-nonsense 249cc single-cylinder engine capable to deliver a staggering 43 PS max power, and being suitable for both intermediate and experienced riders.

This bike comes with lightweight rims and cast aluminum hubs for complying with the rigors of racing over rough terrain, while the 16-way adjustable forks provide excellent damping on any surface, no matter how hard you hit it. Disc brakes are used for the 2004 Kawasaki KX250F to make sure there is enough stopping force for the most demanding riding styles.

Since the 2004 Kawasaki KX250F is not a street-legal bike, you're supposed to ride it on the tracks or non-public roads/ wilderness trails.


2005 Kawasaki KX250[edit]

2005 Kawasaki KX250 2005 Kawasaki KX250 2005 Kawasaki KX250 2005 Kawasaki KX250 2005 Kawasaki KX250

The 2004 Kawasaki KX250 is a middleweight off-road motorcycle for the intermediate and experienced riders. It sport a steel frame designed to provide the ultimate rigidity with minimal weight and the re-engineered swingarm now boasts new sporty linkage angles for better response to the demands of the discerning pilot. With separate air and oil chambers, the front Kayaba suspension is fully adjustable and can offer innumerable setups when combined with the 16-way adjustable compression and rebound rear shock. The 249cc 2-stroke engine is no toy: it produces more than 58 hp, so the addition of petal brake discs is a most welcome upgrade.


2006 Kawasaki KX250[edit]

2006 Kawasaki KX250 2006 Kawasaki KX250 2006 Kawasaki KX250 2006 Kawasaki KX250 2006 Kawasaki KX250

The 2005 Kawasaki KX250 is a dirt/ off-road bike, with no street-legal equipment, such as headlight or blinkers, and is intended for track and non-public roads, as well as for trails in the wild areas. The 2005 KX250 sports a 249cc 2-stroke engine, but this bike is no toy, as it produces in excess of 58 hp and should only be ridden by pilots with at least intermediate experience. The suspensions of the 2005 Kawasaki KX250 provide innumerable setup positions, thanks to the massive 48 mm oleopneumatic Kayaba forks and new Uni-Trak rear shock. The bike weighs in at only 97 kg (214 lbs) and that's one of the reasons for eliminating the electric starter. The lightweight construction is also helped by the steel frame.


2006 Kawasaki KX250F[edit]

2006 Kawasaki KX250F 2006 Kawasaki KX250F 2006 Kawasaki KX250F 2006 Kawasaki KX250F 2006 Kawasaki KX250F

The 2005 KX250F receives some modern tuning from the Kawasaki engineers, so the new bike comes with a power boost, higher-revving engine and other enhancements. The good old 249cc 4-stroker just got better and can deliver a new level of performance.

A 16-way adjustable forks provide excellent damping on any surface, no matter how hard you hit it, while the new, adjustable Uni-Trak rear suspension complements it in a spectacularly efficient manner. Petal disc brakes are used to make sure there is enough stopping force for the most demanding riding styles, while their design keeps brakes clean and in good condition during longer races.


2007 Kawasaki KX250F[edit]

The good old 2006 Kawasaki KX250F 249cc 4-stroker just got better and can deliver a new level of performance, thanks to its revised carburetor, engine and gearbox. The updated piston, intake valves and polished intake ports make sure the fuel and air mix flow faster and steadily, never letting you down.

With a new radiator in place, this motocross machine will keep within the optimal working parameters even in long, hard races. The racing-like aluminum skidplate is taller in front of the engine to prevent mud from accumulating and cause trouble.

A 16-way adjustable forks provide excellent damping on any surface, no matter how hard you hit it, while the new, adjustable Uni-Trak rear suspension complements it in a spectacularly efficient manner. Petal disc brakes are used to make sure there is enough stopping force for the most demanding riding styles, while their design keeps brakes clean and in good condition during longer races.


2007 Kawasaki KX250[edit]

2007 Kawasaki KX250 2007 Kawasaki KX250 2007 Kawasaki KX250

Designed to be ridden by intermediate and experienced pilots, the 2006 Kawasaki KX250 is a nice middleweight off-road bike packing a lot of nifty features. First of all, the bike is not street-legal: it has no headlight and blinkers so it is to be ridden on the dirt and motocross tracks, non-public roads o wilderness trails. The 58 hp (43.3 Kw) 2-stroke liquid-cooled engine is no toy and for dependable stopping force, racing-class petal disc brakes have been installed. Suspensions are fully adjustable and can provide with a plethora of finely-tuned setups for any rider and any riding style on a variety of surfaces. The Kayaba Air Oil System fork and the lightweight, but rigid frame are responsible for the easy handling of the 2006 Kawasaki KX250 even through the sharpest turns.


2008 Kawasaki KX250F[edit]

2008 Kawasaki KX250F 2008 Kawasaki KX250F 2008 Kawasaki KX250F 2008 Kawasaki KX250F 2008 Kawasaki KX250F

Borrowing even more from the factory racers, the 2007 Kawasaki KX250F 249cc is taking further steps towards the modern motocross bikes. Lighter ribless hubs, back alumite-coated rims, short and lightweight silencers, a revised, hardened crankcase and a high-revving engine, they all add up to prove the superiority of the 2007 Kawasaki KX250F over the previous years models.

The engine is loaded in repositioned mounts and rear caliper guard ensures protection during racing on rough terrain, while the Showa twin-chamber fork delivers a stable damping performance. The piggyback rear shock sports enhanced adjustability to make the KX250F respond as needed to the racing abuse. Petal disc brakes are used to make sure there is enough stopping force for the most demanding riding styles, while their design keeps brakes clean and in good condition during longer races.


2008 Kawasaki KX250[edit]

2008 Kawasaki KX250 2008 Kawasaki KX250 2008 Kawasaki KX250 2008 Kawasaki KX250 2008 Kawasaki KX250

The 2007 Kawasaki KX250 is a dirt/ motocross bike powered by a 249cc single-cylinder, liquid-cooled 2-stroke engine capable to deliver more than 58 hp. While the bike's nature is clearly intended for racing purposes, it therefore lacks a headlight and blinkers, being thus illegal for street use. You can enjoy it on the dirt tracks or mountain trails, or non-public roads, however. Given the aggressive and explosive character of the power unit, the 2007 KX250 comes with petal disc brakes for dependable stopping force, while the design of the very rotors keep them clean, with no dust or mud diminishing their capabilities. The perimeter steel frame is both light and rigid, offering great handling, especially with the 2007 KX250 weighing only 97 kg (214 lbs). Fully-adjustable suspensions make this bike suitable for pretty much any rider and any riding style on a variety of surface types.


2009 Kawasaki KX250F[edit]

2009 Kawasaki KX250F 2009 Kawasaki KX250F

The 2008 version of the Kawasaki KX250F sports and even slimmer frame made of aluminum, with revised reinforcement to provide dependable rigidity. To withstand the rigors of motocross racing, the 2009 bike got Showa dual-chamber forks and a redesigned swingarm, while the previous model's rear shock retained the hardware specs, but received upgraded damping characteristics.

A synthetic skidplate was installed, offering the same sturdiness the aluminum one provided but with a lighter design. Wider, serrated footpegs are now in place, to complement other nifty hardware upgrades, such as the factory-style Renthal handlebar and racing-specced petal rotors. If middleweight 4-stroke machines are your game, then the 2008 Kawasaki KX250F is the right toy.


2010 Kawasaki KX250F[edit]

2010 Kawasaki KX250F 2010 Kawasaki KX250F 2010 Kawasaki KX250F 2010 Kawasaki KX250F 2010 Kawasaki KX250F

The 2009 Kawasaki KX250F is a motocross motorcycle powered by a 249cc liquid-cooled single-cylinder engine. Thanks to its lightweight construction, this bike can also be used on other types of dirt tracks and even trails in the wilderness. Be advised that it is not street-legal.

The new year model comes with a higher-grade radiator, less prone to mud build-up, with a thicker profile which makes reinforcement brackets unnecessary, thus shaving off some weight. The titanium-coated Showa dual-chamber forks and revised rear suspension now offer even better shock damping and eliminate the “kicking” effect.

The synthetic skidplate offers the same sturdiness of the old aluminum one but with less mass. The 2009 KX250F sports the 2008 wide, serrated footpegs, factory-style Renthal handlebar and racing-specced petal rotors. The slim shrouds offer enhanced riding ergonomics.


2011 Kawasaki KX250F[edit]

2011 Kawasaki KX250F 2011 Kawasaki KX250F 2011 Kawasaki KX250F 2011 Kawasaki KX250F 2011 Kawasaki KX250F

2010 brings fuel injection for Kawasaki KX250F, transforming it into an even better motocross machine. The electronic injection provides lag-free acceleration, with a more predictable and smoother power deployment, dramatically changing the feel of the bike.

A new Showa fork has been installed, with separate functions for each leg: damping for the left one and spring for the right one, providing far better response on rough surfaces, with smooth yet firm action that's hard to reproduce in conventional forks.

The new throttle body also brings the opportunity for engine mapping tweaking, using the KX FI Calibration Kit. Custom mappings can be easily made while storing and analyzing the riding data can provide great racing improvements for the expert rider.


2012 Kawasaki KX250F[edit]

2012 Kawasaki KX250F 2012 Kawasaki KX250F 2012 Kawasaki KX250F 2012 Kawasaki KX250F 2012 Kawasaki KX250F

The 2011 Kawasaki KX250F takes another step toward a dream motocross bike, now sporting dual injectors, a first in the world class. Revised pistons and a new, lighter throttle body, transform revving up the 2011 KX250F into a thrilling experience: with the body opening quick after 3/8 throttle, the rider should expect an explosion of power and torque.

The separate function Showa fork has been finely tuned: with damping for the left leg and spring for the right one, the new front suspension delivers a smooth, firm action that's hard to reproduce in conventional forks, perfectly matching the fully-adjustable rear shock.

The KX FI Calibration Kit provides custom mappings to transform the 2011 Kawasaki KX250F into a racing machine that's especially adapted to each rider preferences and style.


2013 Kawasaki KX250F[edit]

2013 Kawasaki KX250F 2013 Kawasaki KX250F 2013 Kawasaki KX250F 2013 Kawasaki KX250F 2013 Kawasaki KX250F

The 2012 Kawasaki KX250F boasts revised pistons and a new, lighter throttle body which adds a dramatic thrill to revving up the engine: with the body opening quick after 3/8 throttle, the rider should expect an explosion of power and torque, perfect for fast acceleration or for that sought-after mid-turn brawn. The KX FI Calibration Kit provides custom mappings to transform the 2012 Kawasaki KX250F into a racing machine that's especially adapted to each rider preferences and style.

The separate function Showa fork has been finely tuned: with damping for the left leg and spring for the right one, the new front suspension delivers a smooth, firm action that's hard to reproduce in conventional forks, perfectly matching the fully-adjustable rear shock.


2014 Kawasaki KX250F[edit]

2014 Kawasaki KX250F 2014 Kawasaki KX250F 2014 Kawasaki KX250F 2014 Kawasaki KX250F 2014 Kawasaki KX250F

The 2014 MY Kawasaki KX250F comes with the same 249cc single engine as its predecessors, but the Japanese engineers have introduced some other new technologies to improve the KX250F's performance and carry one the heritage of this off-road performer.

The launch control can be activated while in neutral, the first or second gear to maximize traction with the push of a button. It maximizes the take-off thrust, bettering the odds of a holeshot start.

The transmission has been redesigned, too. It now has four dogs instead of three, and this offers smoother shifts. Also, the shift fork grooves have been improved to enhance feel at the shift lever.

Also, the grips have shorter barrels and are softer to improve rider comfort.


2015 Kawasaki KX250F[edit]

2015 Kawasaki KX250F 2015 Kawasaki KX250F 2015 Kawasaki KX250F 2015 Kawasaki KX250F 2015 Kawasaki KX250F

The 2015 MY Kawasaki KX250F sports some new features and improvements to make the 250cc class two-wheeler perform even better on the dirt.

New revised damping settings in the Showa Separate Function Fork (SFF) and revised Uni-Trak rear shock settings make the bike more responsive and easier to handle. The new adjustable footpegs and handlebar clamps mean that a wider variety of riders may enjoy it, no matter their inseam or armlength.

Also, the brakes are new, with 270mm front and 240mm back rotors. This means more efficient braking before turns and improved overall control over the two-wheeler.


2016 Kawasaki KX250F[edit]

2016 Kawasaki KX250F 2016 Kawasaki KX250F 2016 Kawasaki KX250F 2016 Kawasaki KX250F 2016 Kawasaki KX250F

Speed, power, innovation and great looks, the 2016 KX250F is set to impress. With more urge, our new motocrosser is crafted to reduce lap times benefitting from engine and chassis weight reductions and a raft of engineering innovations. Building on a winning package, the new KX250F takes MX2 to the next level.


2017 Kawasaki KX 250F[edit]

2017 Kawasaki KX 250F 2017 Kawasaki KX 250F 2017 Kawasaki KX 250F 2017 Kawasaki KX 250F 2017 Kawasaki KX 250F

The KX250F comes equipped with a 249cc engine, which is slightly smaller than average for a 4-stroke motor. Its seat measures 37.2 inches off the ground, a height that's only slightly higher than the norm and will accommodate riders of many sizes. The 1.61 gallon fuel tank is 15% smaller than average in this class, meaning the KX250F gives up some range to its competitors.


In Media[edit]


References[edit]

  1. 1997 Kawasaki KX125, 250, 500 Owners Manual. Kawasaki. 


See Also[edit]