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Features

All

At a glance... - New dual injector Digital Fuel Injection system

At a glance... - More robust high-rpm engine output extends deep into the overrev

At a glance... - Revised transmission offers improved shifting action and durability

At a glance... - Thicker, stronger engine components improve reliability

At a glance... - Revised Showa Separate Function Fork (SFF) offers more supple initial hit, and improved action during corner entry

At a glance... - Increased spring rates on front and rear suspension enhance traction and offer a more solid feel

High-Revving, High Performance Engine - 249cc, liquid-cooled, four-stroke, four-valve, single-cylinder DOHC engine delivers hard-hitting power across the rpm range

High-Revving, High Performance Engine - Improved decompressor spring action for easier starting

High-Revving, High Performance Engine - New nickel plating on cylinder walls has a higher adhesion factor for increased durability

High-Revving, High Performance Engine - New connecting rod has a thicker stem for improved reliability

High-Revving, High Performance Engine - New more rigid crankshaft is re-balanced for better performance and higher durability

High-Revving, High Performance Engine - Thicker crank web design features a balance factor on par with the factory racers for reduced engine vibration, smoother power delivery and increased performance in the mid-high rpm range

High-Revving, High Performance Engine - Revised ACG stator and rotor inertia complements the changes made to the crankshaft

Digital Fuel Injection (DFI) System - Upgraded system adds a new “upstream” injector located closer to the airbox

Digital Fuel Injection (DFI) System - All-new second injector features different body size, but same capacity as primary injector

Digital Fuel Injection (DFI) System - Added seal between air inlet port and throttle position sensor unit on the 43mm throttle body protects TPS sensor from fuel penetration

Digital Fuel Injection (DFI) System - Progressive throttle linkage opens more quickly after 3/8 open position

Digital Fuel Injection (DFI) System - Simple and efficient system: No battery, fuses or relays

Digital Fuel Injection (DFI) System - Sharp and precise engine response across entire rpm range

Digital Fuel Injection (DFI) System - Offers easy engine starting

Digital Fuel Injection (DFI) System - Helps prevent engine hesitation after landing from jumps and other high-impact situations

Bridged-Box Bottom Piston - Light and strong piston shares same design as the factory racers, with a new tin plating to optimize its interface with the new nickel plating on the cylinder wall

Bridged-Box Bottom Piston - Changed shape of streak finish improves lubrication and wear resistance

Bridged-Box Bottom Piston - Short piston pin reduces reciprocating weight

Lightweight and Efficient Top End - Lightweight, highly rigid, titanium 31mm intake and 25mm exhaust valves reduce reciprocating weight and offer high-rpm reliability

Lightweight and Efficient Top End - Ultra-light valves have extremely thin valve stems on par with those found in supersport machines; intake valves feature thick heads for increased strength

Lightweight and Efficient Top End - Intake ports designed for peak performance at all rpm, especially in the high-rpm range

Lightweight and Efficient Top End - Special casting method leaves the intake port surfaces extremely smooth for optimum intake efficiency across the rev range

Lightweight and Efficient Top End - Silicon-coated head gasket provides excellent sealing

Stainless Steel Exhaust System - Stainless steel construction offers extra durability

Stainless Steel Exhaust System - High-volume muffler assembly keeps noise levels at 94 dB while retaining power production

Stainless Steel Exhaust System - Joint between pipe and muffler offers excellent sealing, while a rubber damper collar on the rear silencer mount equals serious durability

Efficient Cooling System - Thick and wide radiators are strong and offer excellent resistance to mud buildup while providing superb cooling performance

Efficient Cooling System - Cylinder head water jacket routes coolant to the front of the cylinder head for even cooling

Transmission and Shifting - Shorter shift fork stroke and more smooth solid shift forks (not hollow) offer improved shifting action

Transmission and Shifting - Strong, beefy crankcases feature additional material around the engine mounts to help increase long-term durability

Transmission and Shifting - Clutch cable holder is integrated with the crankcase for accurate feel at the clutch lever

Transmission and Shifting - Scavenge oil filter screen can be accessed without splitting the crankcases, facilitating easier maintenance

Quick-Turning Chassis - Utilizes a low-rigidity steering stem for lighter handling

Quick-Turning Chassis - The KX250F’s slim and lightweight aluminum perimeter frame is composed of forged, extruded and cast parts

Quick-Turning Chassis - Center of gravity and key dimensions such as swingarm pivot, output sprocket and rear axle locations designed to increase forward drive with minimal rear-end squat

Quick-Turning Chassis - Upper engine mounts on head cover sides increase overall rigidity

Race-Oriented Suspension - Revised race-oriented suspension features heavier spring rates and revised damping settings both front and rear

Race-Oriented Suspension - Separate Function Fork (SFF) separates springing and damping functions for less weight, better performance, less stiction and easier adjustability

Race-Oriented Suspension - Fork features the only external spring preload adjustability in its class

Race-Oriented Suspension - Super-hard titanium coating on the outer surface of the inner fork tubes reduces stiction and improves suspension action while also helping prevent scratches and tube damage

Race-Oriented Suspension - Friction-reducing Kashima Coat treatment on the inside of the outer fork tubes contributes to smoother suspension action

Race-Oriented Suspension - Wrap-around fork tube guards provide greater protection for the inner tubes

Race-Oriented Suspension - Altered piston rod specs improve shock setting flexibility and offer better rear wheel traction

Race-Oriented Suspension - Features Kashima Coat on the inside of the shock reservoir for reduced friction and smoother suspension action

Race-Oriented Suspension - Rear shock features dual compression adjustability, allowing high-speed and low-speed damping to be tuned separately

Superior Rear-Wheel Traction - Swingarm features optimum internal bracing and flex characteristics for superb cornering performance

Superior Rear-Wheel Traction - Alloy swingarm uses a cast front section, tapered hydroformed spars and forged chain adjusters

Superior Rear-Wheel Traction - Uni-Trak® rear suspension linkage system mounts the suspension arm below the swingarm, allowing more rear suspension stroke and precise tuning

Superior Rear-Wheel Traction - Linkage system receives upgraded tie-rod which has less rigidity for smoother suspension action and improved traction

Superior Rear-Wheel Traction - Linkage ratios for the Uni-Trak rear suspension match rear shock damping settings to achieve maximum rear wheel traction

Rider Interface - Bodywork components offer the rider a slim interface, making it easy for racers to feel comfortable and go fast

Rider Interface - Formed using a double-injection molding process, the two-tone shrouds offer a slim design

Rider Interface - Side number plates also two-toned and contribute to the slim package

Rider Interface - Right side panel has an added passageway to help cool the silencer

Rider Interface - Frame is wider at the ankles to offer better grip and narrows near the bend below the seat to allow a slim riding position

Rider Interface - Slim seat features upgraded polyurethane, designed for greater durability

Rider Interface - Seat has a slip-resistant top and side surface for good grip when seated and while standing

Rider Interface - 50mm wide (front-to-rear) footpegs offer superb grip and feel at the pegs

Rider Interface - Clutch cable boot features a large quick adjuster, making it easy for riders to adjust play in the clutch cable while on the fly

Rider Interface - Throttle grip has a one-piece collar that provides additional stability during throttle operation

Rider Interface - Lightweight short-length grips feature a pattern designed to provide excellent grip

Factory-Style Components - Black alumite-coated rims, just like the factory racers

Factory-Style Components - Titanium coated inner fork tubes to minimize stiction

Factory-Style Components - Lightweight rims offer maximum strength and weight savings

Factory-Style Components - Thick and rigid front fender

Factory-Style Components - Rear brake pad material offers powerful braking performance

Factory-Style Components - Front and rear petal brake discs help reduce unsprung weight, and the wave shape helps clean the brake pads for more efficient stopping performance

Factory-Style Components - Rear caliper guard protects caliper from damage

Factory-Style Components - Ribless rear hub and butted spokes further reduce unsprung weight

Factory-Style Components - Renthal aluminum handlebar is standard equipment

Factory-Style Components - Blue ignition cover plugs and oil filler cap match the blue accents on the factory race bikes

Factory-Style Components - Factory-style graphics complement the KX250F’s highly tuned performance

Additional Features - New countershaft sprocket cover improves look

Additional Features - New polyurethane resin drive chain roller reduces weight

Additional Features - Redesigned air boot allows room for second fuel injector

Additional Features - Large resin skid plate offers great protection with minimum weight

Specifications

Photos

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