1998-2003 KTM 125/200 SX/MXC/EXC Engine Repair Manual (P/N 320588-E)
KTM Models Covered & Key Technical Specifications
Models: KTM 125 SX, KTM 125 EXC, KTM 125 EGS, KTM 125 EXE, KTM 200 MXC, KTM 200 EXC, KTM 200 EGS, KTM 125 Supermoto
Sub-models / Variants: SX, MXC, EXC, EGS, EXE, Supermoto, 2-stroke, 6-speed, Liquid-cooled, Single-cylinder
Trade Names: KTM 125, KTM 200
Model Years: 1998–2003
Technical Data:
- Engine Displacement: 124.8 ccm (125 models) and 193 ccm (200 models)
- Bore/Stroke: 54.25/54 mm (125) and 64/60 mm (200)
- Clutch: Multi-disc, hydraulic operated
- Transmission: 6-speed, claw-actuated
- Ignition System: Kokusan 2K-1, 2K-2, 2K-3 variants
- Spark Plug Electrode Gap: 0.60 mm (0.024 in)
- Ignition Timing: 1.4 mm BTDC (125) or 1.6 mm BTDC (200)
- Coolant Capacity: 1.2 liters (40% antifreeze/60% water)
KTM Manual Features & Content Preview
- Official KTM publication (Art No 3.206.005-E, dated November 2002) covering the 1998–2003 125 and 200 SX, MXC, and EXC engine series
- Contains 158 pages of technical specifications, assembly sequences, and diagnostic reference data
- This specific edition includes the 2002/2003 updates for both displacement configurations, incorporating the latest factory-revised specifications
Engine Disassembly and Technical Preview
This factory documentation provides a comprehensive breakdown of the 125 and 200cc two-stroke powerplants. Mechanics get a clear view of how to properly pull the engine from the frame and reinstall it. The content covers cooling system routing, carburetor integration, and hydraulic clutch maintenance. Beyond the external components, the chapters dive deep into the bottom end. Expect detailed layouts for inspecting the crankshaft, transmission shafts, shift mechanisms, and cylinder head components. Factory tolerances and precise wear limits are outlined for piston rings, clutch discs, and the reed valve block to ensure exact alignment with original manufacturing standards.
Specification and Data Reference
Accurate numbers are everything when rebuilding these specific KTM engines. This publication delivers the exact reference values required for assembly and precision tuning. It highlights essential tightening torques, noting the critical 180 Nm for the primary sprocket nut and 120 Nm for the inner clutch hub. Electrical diagnostics are thoroughly mapped out. Technicians will find resistance values for primary and secondary coils across the Kokusan 2K-1, 2K-2, and 2K-3 ignition systems. Other key metrics include the exact 0.60 mm spark plug gap and the required control flap dimension (Dimension Z) to guarantee optimal exhaust power valve actuation. Working on high-performance two-stroke engines demands absolute precision; always verify you possess the proper mechanical experience and specialized tools before beginning a teardown to prevent equipment damage or severe personal injury.
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