2006 Kawasaki KX250
General Specifications
| Model | Kawasaki KX250 |
| Year | 2006 |
| 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 preload, high/low-speed compression and rebound damping |
| Rear Suspension Travel | Approximately 310 mm |
| Fork Oil | KHL15-10 (Kayaba 01) or equivalent; twin-chamber Kayaba fork |
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, API SE/SF/SG or SH/SJ with JASO MA; 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. |
2006 Kawasaki KX250 – Refining the Redesigned Two-Stroke
The 2006 Kawasaki KX250 was primarily a refinement of the heavily redesigned 2005 machine rather than another new generation. Kawasaki retained the steel perimeter chassis, 249 cc KIPS-equipped two-stroke engine and 48 mm Kayaba twin-chamber fork introduced the previous year, while concentrating on smaller changes to suspension, reliability and rider feel.
Engine changes included a revised piston profile and other detail improvements, while the exhaust system received a longer, larger-volume silencer. The basic 66.4 x 72.0 mm engine architecture and Keihin PWK38S carburettor remained familiar. Owners rebuilding the induction system can compare replacement carburettor options when the original unit is worn or missing.
Suspension received useful updates. The Kayaba fork gained a revised internal sleeve intended to improve resistance to bottoming, while the Uni-Trak rear shock once again provided separate high- and low-speed compression adjustment. Correct servicing is important on the twin-chamber fork, and the MXOwners fork oil reference can help when checking suitable oil information.
The 2006 bike also gained Renthal aluminium handlebars and petal-style brake rotors. It retained kick starting, a five-speed gearbox and premixed fuel, with a 32:1 ratio commonly specified for competition use. The MXOwners premix calculator makes mixing different fuel quantities straightforward. Historically, the 2006 KX250 sits near the end of Kawasaki's full-size two-stroke era, carrying forward the major 2005 redesign with targeted improvements rather than wholesale change.
