Kawasaki KX250F User Manual

2011
Specications:
KX250YBF
Engine Type 4-Stroke, Liquid Cooled, DOHC, 4-Valve, Single, DFI
Displacement 249.0 cm³
Bore & Stroke 77.0 x 53.6 mm
Compression Ratio 13.5:1
Fuel System Keihin 43 x 1, Digital Fuel Injection
Ignition Digital DC-CDI
Transmission 5-Speed
Front Wheel Travel 315 mm
Rear Wheel Travel 310 mm
Front Tire Size 80/100-21
Rear Tire Size 100/90-19
Front Suspension Separate Function front Fork, 47 mm Inverted Twin-Cham-
Rear Suspension
Wheelbase 1,475 mm
Front Brake
Rear Brake
Fuel Tank Capacity 7.2 litres
ber cartridge-type fork with 22-way compression and 20­way rebound damping adjustment, 60-way spring preload. Titanium Oxide Coating.
New UNI-TRAK with gas-charged shock absorber which features fully adjustable spring preload, 17-way rebound and 13-way (low-speed) and 2 or more turns of high speed compression damping adjustment.
Semi Floating 250 mm Petal Disc & Twin Piston Calliper
240 mm Petal Disc & Single Piston Calliper
Key Features:
Digital Fuel Injected Engine
Separate Function Front Forks
Revised Aluminium Chassis with Improved
Handling
Ground Clearance 330 mm
Seat Height 945 mm
Curb Mass 105.7 kg
Colours Lime Green
(Specications subject to change without notice.)
(Includes full fuel tank and all uids at correct levels)
2011 KX250F
High-Performance, Fuel Injected, Liquid Cooled, 4-Stroke Engine in Race Winning Chassis
There are nearly 30 upgrades to the 2011 Kawasaki KX250F, reecting the rigor of testing and development happening at Kawasaki. Engineers started with what’s arguably the gold standard in 250-class racing – the 2010 KX250F – winner of the 2010 AMA East and West Supercross Lites titles.
Loads of engine modications have made the latest KX an absolute corner-to-corner screamer. Renements to the 249cm³ single include higher compression, a modied top on the exclusive Bridged-Box Bottom piston, higher valve lift, longer spark plug design, and a new coil that offers a hotter and longer-lasting spark. And, the addition of Digital Fuel Injection (DFI) produces stunning – and more useable – power. The system automatically adjusts to suit track and climate conditions, even when the going gets rough.
- Exhaust revison to meet stricter noise regulations
High-speed Chassis with Factory-styled components and tuning
- Separate Function fron Fork (SFF) offers signicantly reduced friction to realise smooth fork action and rm damping performance (rst time used on a mass-production motorcrosser)
- Left fork tube: damping assembly
An optional ECU Setting Tool allows racers to select from several different ECU data maps or ne tune a custom map. The tool can also record up to six hours of data, including engine rpm, degree of throttle opening, coolant and air temperatures, ignition timing, fuel adjustments, gear position and system voltage.
Headlining the chassis changes on the 2011 KX250F is Kawasaki’s new Separate Function Fork. Instead of a conventional fork design, the SFF separates spring and damping duties (one in each leg) for improved performance, less friction, lower weight and easier adjustability. The right leg has the spring, with a larger main spring/rod assembly than traditional forks; the left leg handles damping, with rebound and compression damping adjustable on the fork tube.
As for ergonomics, the KX250F’s bodywork offers riders a slim interface and a natural positioning that make going fast a sim­ple affair. The upgraded seat provides excellent seated grip and rider mobility, and features rm urethane foam to hold its shape longer.
MORE POWERFUL, FUEL INJECTED ENGINE
- Specs on par with our Factory Racers
- Strong power at all engine speeds
- Quick throttle response
- Superb over rev charactoristic
- High-performance piston with bridged-boxed bottom (unique Kawasaki feature among mass-production models) straight from our Kawasaki Factory Racers
- Light weight battery-less fuel injection system
- Stronger low and mid torque allows riders to corner a gear higher (less shifting)
-KX FI calibration Kit (optional) indentical to our Factory Teams
- Right fork tube: spring
Benets include:
- reduce friction (-25%) = increased riding comfort
- space for preload adjuster (simplies task of setting fork preload or ride height)
- race friendly: suspension jobs are quicker and easier
Chassis ne-tuning for revised rigidity balance results in increased lateral chassis ex
Benets Include:
- lighter turning
- increased front wheel traction
- more planted feel from front wheel
- enhanced cornering accuracy Control maintained during high-speed (in straights and when cornering)
Factory Styling
- agressive graphics
- blacked out rims
- blue alumite1 nish on fork adjuster and rear suspension upper adjuster
AT A GLANCE
Factory Inspired Tuning
Tuned for high performance, the wide powerband extends way into the over­rev. A works-base bridged-box bottom piston (used for the rst time on a mass-production motocrosser on the 10MY KX250F) is just one of the features inspired by our factory racers.
All-aluminium perimeter frame
Slim perimeter frame is lightweight construction composed of forged, extruded and cast parts.
Reduced Noise
Changes to mufer internals ensure that stricter noise levels are met.
Rear Shock Absorber
Dual compression adjustabil­ity offers a wide range of tuning options. Kashima Coat on the tank cylinder improves action. Revised damping settings contribute to improved action and increased absorption performance
Seat
Revised pattern for the seat side offers more grip.
Slim Rider Interface
Bodywork components and seat design offer a slim, natural riding position making it easier to for racers to go fast.
Renthal Handlebars
Factory-styled handlbars and pad saves weigth.
Factory-styling
Factory-style graphics, black alumite1 rims, black fork guards and blue alumite1 nish on the fork adjusters and rear suspension upper adjuster give the KX250F the looks to match its highly tuned performance.
Separate Function Front Forks
Used for the rst time on a mass-production motocrosser,the SFF locates its damping assembly in the left fork tube and a spring in the right. Signicantly reduced friction makes it possible to realise the combi­nation of smooth action and rm
damping perform­ance. The addition of a preload adjuster facilitates machine setup. Improved left/right balance con­tributes to handling. Low-friction titanium coating (unique in this class) smoothes fork action.
Lighter Handling Chassis
Increased chassis ex, revised rigidity balance and reduced fork offset result in lighter turning, increased rear wheel traction, a more planted feel from the front wheel and enhanced cornering accuracy.
Setting-adjustable motocross ECU
Lightweight ECU was designed specically to withstand the rigors of motocross racing. Settings can be repro-
grammed with an optional KX FI Calibration Kit.
Petal Disc Brakes
Front and rear petal brake disc offer efcient braking
performance
Liquid-cooled, 4-stroke Single with Digital Fuel Injection
Now fuel-injected, the engine offers the same high-revving performance while ensuring stable fuel-metering in all conditions. A new piston crown and higher compression ratio offer increased high-rpm and over-rev, while a deep-protrusion spark plug and revised intake ducting contribute stronger low-mid torque.
Less Missed Shifts
revisions offer more accurate shfting
Shift mechanism
Lightweight Fuel Pump
Newly designed fuel pump located inside fuel tank is a lighweight construction
Progressive Throttle Link
Lightweight 43 mm throttle body uses two shafts joined by a pro­gressive link to give sharp response and excellent power feeling
New Uni-Trak Rear Suspension
Linkage mounts below the swingarm for more precise suspension tuning.
Loading...
+ 6 hidden pages