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Standard Features
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The 2015 model year introduces a host of new updates designed to retain the crown as the most successful 250F on the market.

The record books don’t lie. Whether it’s Team Green™ amateur racing, professional AMA Supercross or Motocross, the most successful 250 cubic centimeter motocross bike in the 4-stroke category just got even better thanks to a series of upgrades designed to maximize the performance of this already impressive motorcycle.


Model Year


85.4 in.
50 in.
32.3 in.
233.7 lbs. curb
Ground Clearance
13 in.
58.1 in.
Seat Height
37.2 in.


4-stroke single, DOHC, 4-valve cylinder head
249 cc
Bore x Stroke
77 x 53.6 mm
Compression Ratio
Fuel System
DFI® with 43 mm Keihin throttle body and dual injectors
Fuel Tank Capacity
1.6 gal.
Digital DC-CDI
Wet, multi-disc, manual


Final Drive


Front: Single semi-floating 270 mm petal disc with 2-piston caliper
Rear: Single 240 mm petal disc with 1-piston caliper
Front: 80/100-21
Rear: 100/90-19


Aluminum perimeter
Front: 48 mm inverted Showa SFF telescopic fork with 40-way spring preload adjustability, 22-position compression and 20-position rebound damping adjustability; 12.4 in. travel
Rear: Uni-Trak® linkage system and Showa shock with 19-position low-speed and 4 turns high-speed compression damping, 22-position rebound damping and fully adjustable spring preload; 12.2 in. travel
5 in.


Lime Green

Standard Features

 Revised damping settings in the Showa Separate Function Fork (SFF) provides progressive damping force and features 48 mm inner fork tubes for rigidity  
 Revised Uni-Trak® rear shock settings  
 New 270 mm “oversized” front rotor, petal-style braking-brand rotors for front / rear  
 New finer-atomizing Downstream Fuel Injector and revised ECU settings  
 Launch Control increases ability to get good starts, by maximizing available traction  
 New Bridged-box bottom piston  
 New Magneto Rotor with increased inertia  
 Adjustable footpegs and handlebar clamps  
 Lighter sub-frame  
 New factory-styling  
High-revving, High-performance Engine
 249 cc, liquid-cooled, 4-stroke, 4-valve, 1-cylinder DOHC engine delivers hard-hitting power across the rpm range  
 Nickel plating on the cylinder wall has a high adhesion factor for optimum durability  
 Thick-stem connecting rod resists flex and enhances durability  
 Upgraded crankcase oil jet delivers an optimized stream of oil to the underside of the new Bridged-box piston with short skirts and reinforced external ribs for increased strength  
 Thick crank web design features a balance factor on par with the factory racers to help minimize engine vibration, provide smooth power delivery and maximize performance in the mid-high rpm range  
Factory-style Launch Control System
 The KX250F Launch Control was a first for the 250 class and increased the rider’s ability to get good starts by maximizing available traction  
 Launch Control is activated by pushing a button on the left handlebar while stopped, in neutral, first or second gear  
 Retards ignition timing in first and second gears, giving the greatest effect within the first few seconds of releasing the clutch  
 Shifting into third gear automatically deactivates Launch Control Mode and returns the ignition to normal mapping  
 Particularly effective when chasing the holeshot from concrete starting pads and other slippery surfaces  
Digital Fuel Injection (DFI®) System
 New finer-atomizing Downstream Fuel Injector and revised ECU settings  
 The dual injectors are fine-atomizing injectors with four holes. The upstream injector has a droplet size of 120µm, while the new downstream injector is 75µm. The finer size and wider spray pattern contributes to a stronger low to mid-range power, improved response and quicker acceleration.  
 Intake tract design provides optimal airflow from the airbox into the combustion chamber  
 Seal between air inlet port and throttle position sensor unit on the 43 mm throttle body protects TPS sensor from fuel penetration  
 Progressive throttle linkage for sharp and precise throttle response across entire rpm range  
 Simple and efficient system: No battery, fuses or relays  
 Offers easy engine starting  
Bridged-box Bottom Piston
 Thicker dome and reinforcing ribs increase durability  
 Piston profile helps increase reliability compared to non-box bottom design  
 Light and strong piston shares same design as the factory racers, and a tin plating to optimize its interface with the nickel plating on the cylinder wall  
 Special finish improves surface lubrication and wear resistance  
 Short piston pin reduces reciprocating weight  
Lightweight and Efficient Top End
 Intake valve seat material offers increased durability  
 Ultra-light valves have extremely thin valve stems on par with those found in supersport machines; intake valves feature thick heads for increased strength  
 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
 Short header and resonator chamber enhance low-end power and provide strong top-end power  
 Head pipe resonator chamber helps boost low-rpm torque  
 Short high-volume muffler assists with mass centralization, makes good power, while large cross section restricts noise levels to an AMA race-legal 94 dB  
 Durable stainless steel construction  
Efficient Cooling System
 Thick 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
 Transmission gears feature 4 dogs for smooth shifting  
 Shift-fork grooves enhance feel at the shift lever  
 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
 The KX250F’s slim and lightweight aluminum perimeter frame helps provide excellent ergonomics and handling  
 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  
Separate Function Fork
 Revised settings on the 48 mm Separate Function Fork (SFF) delivers firm damping and increased ride control  
 SFF design separates spring and damping functions for less weight, better performance, less stiction and easier adjustability compared to traditional forks  
 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 excellent protection for the inner tubes  
Uni-Trak® Rear Suspension
 Revised rear shock matches performance of the front forks  
 Rear shock has dual compression adjustability, allowing high-speed and low-speed damping to be tuned separately  
 Features Kashima coating on the inside cylinder wall for reduced friction and smoother suspension action  
 Swingarm features 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 ratios for the Uni-Trak rear suspension match rear shock damping settings to achieve maximum rear wheel traction  
Rider Interface
 New 2-position, adjustable footpeg brackets allow rider to lower the position by 5 mm, lowering the center of gravity  
 New 4-position upper triple clamp with 2 sets of handlebar mount slots. These give the rider a choice of 4 bar positions, including 25 mm forward, 15 mm forward, standard or 10 mm back to suit many sizes and styles of riders.  
 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 shrouds offer a slim design  
 Right-side panel passageways help cool the silencer  
 Flat design of the seat and tank allow freedom of movement  
 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 polyurethane designed to be durable  
 Seat has a slip-resistant top and side surface for good grip when seated and while standing  
 50 mm 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 1-piece collar that provides additional stability during throttle operation  
 Grips have short barrels and are made from soft material to enhance rider comfort  
Factory-style Components
 Pushrod-type front brake master cylinder and brake pad material provide strong brake force and enhanced feel  
 Rear brake pad material offers powerful braking performance  
 Lightweight black anodized rims are durable and look just like the factory racers  
 Titanium-coated inner fork tubes minimize stiction and look great  
 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 reduce unsprung weight  
 Renthal aluminum handlebar is standard equipment  
 New green anodized suspension adjusters, engine oil cap and generator cover plugs like the factory race bikes  
 Factory-style graphics complement the KX250F’s performance  
Additional Features
 Radiator shrouds and side panels provider a slim rider interface and a nimble feel  
 Embossed design on clutch cover  
 High-density chain pad on top of the swingarm is more resistant to wear  
 Large resin skid plate offers great protection with minimum weight  


Lime Green

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*Price, if shown, is Manufacturer's Suggested Retail Price (MSRP) and does not include government fees, taxes, dealer freight/preparation, dealer document preparation charges or any finance charges (if applicable). MSRP and/or final actual sales price will vary depending on options or accessories selected.

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