Kawasaki KX250

1999power
Liquid Cooled Engine with Kawasaki Integrated PowerKeihin Power Jet PWK38S Carburetor with K-TRIC
Valve System"Shorty" design places the mainjet and slide closer to
KIPS system controls exhaust port height forthe cylinder for improved throttle response
increased power and torqueKawasaki Throttle Responsive Ignition Control
Increased flywheel effect helps the rear tire hook up(K-TRIC) uses a sensor and alter ignition timing
The output shaft now has involute splines at theaccording to throttle position and engine speed for
countershaft sprocket for less play, quickerbetter throttle response and more power
acceleration and increased durabilityRevised Power Jet system uses an electronic
Keihin Power Jet PWK38S Carburetor with K-TRICsolenoid to close a fuel passageway at two separate
New "shorty" design places the mainjet closer to therpm settings to extend the power peak and increase
cylinder for improved throttle responsetop-end power at over-rev
Kawasaki Throttle Responsive Ignition ControlUNI-TRAK Rear Suspension
(K-TRIC) uses a sensor and alter ignition timingCast aluminum section is redesigned for less unsprung
according to throttle position and engine speed forweight and more rigidity
better throttle response and more powerThe shock now features both low- and high-speed
Power jet system uses an electronic solenoid to closecompression damping adjustments
a fuel passageway at high rpm to extend the powerAluminum shock components reduce unsprung weight
peak and increase top-end power at over-revTriple-rate shock spring makes shock action even
Airbox and bootmore progressive
New airbox and stiffer connecting boot improve48 mm Upside Down Cartridge Fork
airflow around the shock to improve top-end powerNew bladder system helps smooth out jolts and
UNI-TRAK Rear Suspensioncontrol bottoming
Cast aluminum section is redesigned for less unsprungNew .43 kg/mm fork springs
weight and more rigidityPolished internal surfaces for smooth action
Redesigned needle bearings and sleeves reduceNew piston assembly on the cartridge is speed
unsprung weight and prevent incorrect assembly thatsensitive
can cause them to bindFront and Rear Disc Brakes
The shock now features both low- and high-speedRedesigned front brake caliper for better feel
compression damping adjustmentsImproved dust seals at the rear brake lever and caliper
The shock oil seal head assembly and adjuster capHigh Tensile Steel Perimeter Frame
changed to aluminum and the aluminum shock clevis isCompact and quick handling
now lighter to reduce unsprung weightRemovable aluminum rear sub-frame for easy access
New triple-rate shock spring improves suspensionto the rear shock
action at full compressionDetail Changes
46 mm Upside Down Cartridge ForkNew graphics
New aluminum upper fork tubes are smaller inFlat seat allows free rider movement
diameter at the upper clamping area (54 mm to 52New handlebar bend for increased rider comfort
mm) for a plusher ride and less weight2001
Stronger inner and outer fork tubes have moreFirst gear ratio changed and flywheel weight changed
overlap to improve suspension action, especially onfor better throttle response and acceleration
"slap-down" landings2002
New rubber bottoming damper and 10 mm longer forkHigher Compression Ratio, Beefier 48mm forks,new
bottoming cone reduce bottomingtwinspark ignition system, new 2 piece KIPS
New fork leg lowers with two-bolt axle clampspowervalve, and revalved rear shock.
increase front end rigidity2003
Several internal components changed to aluminumFuel Mixes, from 30:1, to 40:1 or 52.5:1
Front and Rear Disc Brakes2004
New ceramic coating on backing of rear brake pads2005
insulate them from heatEven Suspension Layout
Backing plates now thicker to prevent warping underLarger Fuel Tank
extreme conditionsLarger Radiator
High Tensile Steel Perimeter FrameInternal Spark Arrestor
Upper frame rails lowered slightly to lower fuel tankOppositional Combustion Chamber Layout
and provide flatter seating positionThird Gear Ratio Moved Up 0.012 Degrees
New aluminum rear sub-frameCombustion Rate Improved
Detail ChangesLeading Fuel Line Made 2 mm Wider for Enhanced
New graphics and restyled rear fender and radiatorRiding Capabilities
shroudsAngled Piston Improves Horsepower by 2HP
Flatter seat allows freer rider movementRiding Position Lowered for Easy Handling
New handgrips offer better feelKing Hart Racing Chain is Stock
Rerouted clutch cable for easier pullby: naudiaWobbling at High Speeds is Reduced By Carefully
vengeace from commerce TexasShaped Air-Intake Ports
2000An Extra large aftermarket Spark Plug is Stock
Liquid Cooled Engine with Kawasaki Integrated PowerSpark Arrestor 1.2 mm Wider
Valve SystemHeat Proof Radiator Tubes Increase Performance
Revised porting for increased low-end and mid-rangeEntire Exhaust System polished on inside for Lower
powerfuel consumption
Revised KIPS system controls exhaust port height forRadiator Capacity has Increased From 800mls to
increased power and torque1030mls.
KIPS governor bearing size is larger for increasedEvolved Piston head shape Increases displacement by
durability4cc
Electrofusion cylinder0.25 Litre Engine enhanced by stronger fuel Jets
Improves heat transfer for consistent power output8 Litre Fuel tank is increased to 8.5 Litres
It is porous so it holds lubrication well2006
It is hard so it resists abrasion and seizureRenthal aluminum handlebars.
Allows closer piston-to-cylinder clearances for moreNew piston profile and muffler design.