2007 Kawasaki KX250
General Specifications
| Model | Kawasaki KX250 |
| Year | 2007 |
| Category | Motocross |
| Engine Type | 249 cc single-cylinder, two-stroke, piston reed-valve, liquid-cooled with KIPS |
| Weight | Approximately 97 kg dry |
Engine
| Displacement | 249 cc |
| Bore x Stroke | 66.4 x 72.0 mm |
| Compression Ratio | 10.5:1 low speed / 9.1:1 high speed |
| Fuel System | Keihin PWK38S 38 mm carburettor with Power Jet | Replacement Options |
| Ignition | Digital CDI |
| Spark Plug | NGK BR8ECMVX |
| Spark Plug Gap | 0.7-0.8 mm |
| Cooling System | Liquid-cooled |
| Starting System | Primary kick starter |
Transmission
| Transmission | 5-speed constant-mesh, return shift |
| Clutch | Wet multi-disc |
| Final Drive | Chain, 13/51 final gearing, 520 chain |
Dimensions
| Overall Length | Approximately 2,185 mm |
| Overall Width | Approximately 815 mm |
| Overall Height | Approximately 1,265 mm |
| Wheelbase | Approximately 1,480 mm |
| Ground Clearance | Approximately 340 mm |
| Seat Height | Approximately 965 mm |
| Fuel Capacity | Approximately 8.2 L |
Chassis
| Frame | High-tensile steel perimeter motocross frame with aluminium swingarm |
| Front Tyre | 80/100-21 51M | Tyre Size Guide |
| Rear Tyre | 110/90-19 62M | Tyre Size Guide |
Suspension
| Front Suspension | 48 mm Kayaba inverted twin-chamber cartridge fork, adjustable compression and rebound damping | Fork Oil Levels |
| Front Suspension Travel | Approximately 300 mm |
| Rear Suspension | Uni-Trak linkage with Kayaba gas-charged shock, adjustable spring preload, high/low-speed compression and rebound damping |
| Rear Suspension Travel | Approximately 310 mm |
| Fork Oil | Kayaba KHL15-10 / Kayaba 01 or equivalent twin-chamber fork oil |
Brakes & Wheels
| Front Brake | Single hydraulic petal disc |
| Rear Brake | Single hydraulic petal disc |
| Front Wheel Size | 21 x 1.60 in |
| Rear Wheel Size | 19 x 2.15 in |
Service Data
| Fuel Type | Premium unleaded petrol |
| Premix Information | 32:1 fuel/oil mixture using high-quality two-stroke racing oil | Premix Calculator |
| Gearbox Oil | SAE 10W-40 motorcycle oil meeting API SE/SF/SG or SH/SJ and JASO MA specification; approximately 0.85 L capacity |
| Air Filter | Washable oiled polyurethane foam element |
| Service Notes | Competition motocross machine. Maintain the correct premix ratio and inspect the air filter, spark plug, transmission oil, coolant, drive chain and KIPS exhaust-valve system frequently. |
2007 Kawasaki KX250 – The Final Full-Size Kawasaki Two-Stroke
The 2007 Kawasaki KX250 was largely a carry-over development of the extensively redesigned 2005 platform and the refined 2006 model. There was no completely new engine or chassis generation for 2007; instead Kawasaki continued with its proven 249 cc KIPS-equipped two-stroke, steel perimeter frame and Kayaba suspension package.
The engine retained its 66.4 x 72.0 mm bore and stroke, five-speed transmission and Keihin PWK38S 38 mm carburettor. Correct jetting remains important on these bikes, particularly when exhaust systems, fuel, temperature or altitude differ from standard. Owners rebuilding an incomplete machine can compare replacement carburettor options when the original unit is damaged or missing.
The 48 mm Kayaba twin-chamber fork and Uni-Trak rear suspension also carried forward, giving the KX250 approximately 300 mm of front travel and 310 mm at the rear. Owners servicing the front end can refer to the MXOwners fork oil reference for fork servicing information.
The 2007 KX250 is historically significant because it marked the end of Kawasaki's full-size production 250 two-stroke motocross line. It still used the classic competition formula of kick starting, premixed fuel and a lightweight two-stroke engine. The MXOwners premix calculator is useful for preparing its 32:1 fuel mixture accurately. For owners today, the 2007 model represents the final evolution of decades of KX250 development before Kawasaki's 250-class focus moved completely to four-strokes.
