2003–2007 Kawasaki KX125 & KX250 Service Manual

• Covers 2003–2007 Kawasaki KX125 and 2003–2004 KX250 two-stroke competition motorcycles (M1 through M7F series variants).
• Official factory reference featuring 47 exploded-view assembly diagrams and 35 specification tables.
• The definitive source for exacting carburetor jetting and KIPS valve operation metrics for these engines.

System Documentation and Maintenance Overview

This factory-authorized reference delivers the exact specifications required to keep the Kawasaki KX125 and KX250 performing at peak competition levels. Mechanics and dedicated DIYers will find immense value in the sheer technical depth provided here. Delivered as a convenient PDF, it significantly streamlines daily workshop routines by providing direct access to exact factory tolerances for components like the chrome composite plating cylinder and KIPS governor, preventing costly engine seizures and saving hours of diagnostic time. You receive complete diagnostic and teardown documentation for the entire motorcycle. This includes the fuel system, cooling, engine top-end, bottom-end, transmission, brakes, final drive, electrical system, and steering. The manual outlines component-level details for the Kawasaki Integrated Power Valve System (KIPS) and the specific Mikuni and Keihin carburetor setups for both engine displacements. Please ensure you observe all manufacturer safety protocols and torque limits when working on high-performance brake or engine components to avoid component failure or personal injury.

To save a costly trip to the dealership, this manual includes the exact step-by-step procedural overviews needed to tackle heavy-duty jobs in your own shop:

• Complete crankcase splitting and bottom-end overhauls
• Up-side-down telescopic front fork oil level adjustments
• Uni-Trak rear shock absorber disassembly and oil changes
• Multi-disc wet clutch inspection and component replacement
• Ratchet-type transmission shift mechanism servicing
• Liquid-cooled two-stroke engine top-end rebuilds
• Keihin PWK38S and Mikuni TMX38X carburetor tuning

To facilitate accurate diagnostics and efficient shop work, the manual features an extensive array of visual aids and technical references:

• Complete electrical wiring diagrams
• Cable, wire, and cooling hose routing schematics
• Racing-focused periodic maintenance charts
• Diagnostic troubleshooting guide tables
• Metric to imperial unit conversion tables
• Fastener tightening torque charts
• Ignition timing adjustment views
• Detailed component exploded views

Specification and Reference Data

Finding the right metric fast is crucial on the bench. When the bike is not running properly, the dedicated troubleshooting section helps isolate the root cause efficiently. Technical specifications are sharply categorized to provide standard values and precise service limits for vital components like the cylinder bore, piston-to-cylinder clearance, and transmission gear ratios. The 340-page workshop publication outlines critical data points essential for accurate repair work on the M-series builds. Key technical parameters detailed inside include:

• Cylinder head nut torque: Specified at 25 Nm (18 ft-lb) for the 2003–2007 Kawasaki KX125.
• Transmission oil capacity: Documented at 0.85 liters for the KX250 model.
• Standard fuel level: Listed at 10 ±1 mm above the carburetor body edge for the KX125-M1.