2010 Kawasaki KX250F
General Specifications
| Model | Kawasaki KX250F |
| Year | 2010 |
| Category | Motocross |
| Engine Type | 249 cc single-cylinder, four-stroke, DOHC, 4-valve, liquid-cooled |
| Weight | 105 kg curb mass |
Engine
| Displacement | 249 cc |
| Bore x Stroke | 77.0 x 53.6 mm |
| Compression Ratio | 13.2:1 |
| Fuel System | Keihin FCR-MX37 37 mm flat-slide carburettor with hot-start circuit | Replacement Options |
| Ignition | Digital AC-CDI with K-TRIC throttle-position sensor |
| Spark Plug | NGK CR8E |
| Spark Plug Gap | 0.7-0.8 mm |
| Cooling System | Liquid-cooled |
| Starting System | Primary kick starter with automatic decompression |
Transmission
| Transmission | 5-speed constant-mesh, return shift |
| Clutch | Wet multi-disc, manual |
| Final Drive | Chain, 13/48 final gearing, 520 chain |
Dimensions
| Overall Length | 2,170 mm |
| Overall Width | 820 mm |
| Overall Height | 1,270 mm |
| Wheelbase | 1,470 mm |
| Ground Clearance | 340 mm |
| Seat Height | 955 mm |
| Fuel Capacity | 8.0 L |
Chassis
Suspension
| Front Suspension | 47 mm Showa inverted twin-chamber telescopic fork, 16-way compression and rebound damping adjustment | Fork Oil Levels |
| Front Suspension Travel | 315 mm |
| Rear Suspension | New Uni-Trak linkage with Showa shock, adjustable spring preload, 13-way low-speed and stepless high-speed compression damping, 17-way rebound damping |
| Rear Suspension Travel | 310 mm |
| Fork Oil | Showa SS19 or equivalent SAE 5W; 180 ml cylinder unit and 369 ml outer tube per fork leg |
Brakes & Wheels
| Front Brake | Single semi-floating 250 mm petal disc, dual-piston caliper |
| Rear Brake | Single 240 mm petal disc, single-piston caliper |
| Front Wheel Size | 21 x 1.60 in |
| Rear Wheel Size | 19 x 1.85 in |
Service Data
| Fuel Type | Premium unleaded petrol |
| Premix Information | Not applicable - four-stroke engine with separate engine lubrication |
| Gearbox Oil | Engine and transmission share the same oil; API SG/SH/SJ/SL, JASO MA/MA1/MA2; SAE 10W-40 recommended. Capacity 0.75 L oil change, 0.80 L with filter, 1.00 L completely dry |
| Air Filter | Washable oiled polyurethane foam element |
| Service Notes | Competition four-stroke motocross engine. Inspect engine oil, oil filter, valve clearance, air filter, coolant, drive chain, brakes and suspension at competition-service intervals. |
2010 Kawasaki KX250F – Refining the Carburetted KX
The 2010 Kawasaki KX250F was a substantial refinement of the all-new 2009 platform rather than another complete redesign. Kawasaki retained the aluminium perimeter frame and Keihin FCR carburettor but revised a surprisingly large number of components, including the piston, cylinder, crankshaft, transmission, radiators, swingarm, steering stem, exhaust and suspension settings.
A new lightweight bridged-box-bottom piston was one of the key engine changes, bringing technology developed for Kawasaki's factory race bikes to the production KX250F. The cylinder, crankshaft and oiling system were revised for improved durability, while larger radiators improved cooling. Fuel delivery remained through the Keihin FCR-MX37 carburettor, making 2010 the final stage of Kawasaki's carburetted 250F development before fuel injection arrived. Owners maintaining the induction system can compare replacement carburettor options.
Chassis development included a revised steering stem and swingarm intended to give lighter handling and improved rider feel. The 47 mm Showa twin-chamber fork and Uni-Trak rear suspension retained extensive adjustment, with revised settings to match the chassis changes. The MXOwners fork oil reference is useful when servicing the twin-chamber front suspension.
For owners today, the 2010 KX250F is an interesting bridge between two eras. It combines a highly developed carburetted four-stroke engine with a modern aluminium chassis immediately before Kawasaki adopted electronic fuel injection for the KX250F. The MXOwners Parts Finder can help when checking replacement components for maintenance or restoration.
