James
Staff member
Optional DFI Calibration Kit
New “upstream” injector which is located closer to the airbox.
At a glance…
• New dual injector Digital Fuel Injection system
• More robust high-rpm engine output extends deep into the overrev
• Revised transmission offers improved shifting action and durability
• Thicker, stronger engine components improve reliability
• Revised Showa Separate Function Fork (SFF) offers more supple initial hit, and improved action during corner entry
• 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
• Improved decompressor spring action for easier starting
• New nickel plating on cylinder walls has a higher adhesion factor for increased durability
• New connecting rod has a thicker stem for improved reliability
• New more rigid crankshaft is re-balanced for better performance and higher durability
• 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
• 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
• All-new second injector features different body size, but same capacity as primary injector
• Added seal between air inlet port and throttle position sensor unit on the 43mm throttle body protects
TPS sensor from fuel penetration
• Progressive throttle linkage opens more quickly after 3/8 open position
• Simple and efficient system: No battery, fuses or relays
• Sharp and precise engine response across entire rpm range
• Offers easy engine starting
• Helps prevent engine hesitation after landing from jumps and other high-impact situations
• Optional accessory calibration Kit features new 6-pin connector type allows easy tunability
• Optional accessory FI Indicator Light allows the DFI system to communicate diagnostic information
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
• Changed shape of streak finish improves lubrication and wear resistance
• 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
• Ultra-light valves have extremely thin valve stems on par with those found in supersport machines; intake valves feature thick heads for increased strength
• Intake ports designed for peak performance at all rpm, especially in the high-rpm range
• Special casting method leaves the intake port surfaces extremely smooth for optimum intake efficiency across the rev range
• Silicon-coated head gasket provides excellent sealing
Stainless Steel Exhaust System
• Stainless steel construction offers extra durability
• High-volume muffler assembly keeps noise levels at 94 dB while retaining power production
• 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
• 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
• Strong, beefy crankcases feature additional material around the engine mounts to help increase long-term durability
• Clutch cable holder is integrated with the crankcase for accurate feel at the clutch lever
• 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
• The KX250F’s slim and lightweight aluminum perimeter frame is composed of forged, extruded and cast parts
• 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
• 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
• Separate Function Fork (SFF) separates springing and damping functions for less weight, better performance, less stiction and easier adjustability
• Fork features the only external spring preload adjustability in its class
• 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
• Friction-reducing Kashima Coat treatment on the inside of the outer fork tubes contributes to smoother suspension action
• Wrap-around fork tube guards provide greater protection for the inner tubes
• Altered piston rod specs improve shock setting flexibility and offer better rear wheel traction
• Features Kashima Coat on the inside of the shock reservoir for reduced friction and smoother suspension action
• 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
• Alloy swingarm uses a cast front section, tapered hydroformed spars and forged chain adjusters
• Uni-Trak® rear suspension linkage system mounts the suspension arm below the swingarm, allowing more rear suspension stroke and precise tuning
• Linkage system receives upgraded tie-rod which has less rigidity for smoother suspension action and improved 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
• Formed using a double-injection molding process, the two-tone shrouds offer a slim design
• Side number plates also two-toned and contribute to the slim package
• Right side panel has an added passageway to help cool the silencer
• Frame is wider at the ankles to offer better grip and narrows near the bend below the seat to allow a slim riding position
• Slim seat features upgraded polyurethane, designed for greater durability
• Seat has a slip-resistant top and side surface for good grip when seated and while standing
• 50mm wide (front-to-rear) footpegs offer superb grip and feel at the pegs
• Clutch cable boot features a large quick adjuster, making it easy for riders to adjust play in the clutch cable while on the fly
• Throttle grip has a one-piece collar that provides additional stability during throttle operation
• Lightweight short-length grips feature a pattern designed to provide excellent grip
Factory-style Components
• Black alumite-coated rims, just like the factory racers
• Titanium coated inner fork tubes to minimize stiction
• Lightweight rims offer maximum strength and weight savings
• Thick and rigid front fender
• Rear brake pad material offers powerful braking performance
• Front and rear petal brake discs help reduce unsprung weight, and the wave shape helps clean the brake pads for more efficient stopping performance
• Rear caliper guard protects caliper from damage
• Ribless rear hub and butted spokes further reduce unsprung weight
• Renthal aluminum handlebar is standard equipment
• Blue ignition cover plugs and oil filler cap match the blue accents on the factory race bikes
• Factory-style graphics complement the KX250F’s highly tuned performance
Additional Features
• New countershaft sprocket cover improves look
• New polyurethane resin drive chain roller reduces weight
• Redesigned air boot allows room for second fuel injector
• Large resin skid plate offers great protection with minimum weight
Optional Accessories
• Optional DFI Calibration Kit allows custom tuning
• Optional FI Indicator Light allows the DFI system to communicate diagnostic information
• Optional engine parts include magneto rotors with different inertias and a 12-tooth output sprocket
• Optional chassis parts include handlebar holder for a 1 1/8-inch handlebar
• 46 to 50-tooth aluminum and steel rear sprockets, solid petal brake rotors, different fork and shock springs and manual decompression lever and cable
I expect it to be delivered no later than August. 
get a real bike 
You know what, that might actually help me corner better, throw in the training wheels while you're at it. 
