1998-2003 KTM 125/200 SX/MXC/EXC Engine Repair Manual

Get your KTM 125/200 SX/MXC/EXC engines running smoothly with this essential service manual. Covers 1998-2003 models. Part number 320588-E.

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Document Details

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Document Number / Seller:
25365 / Robert Torres
File Size:
14.69 MB
File Type:
PDF
Language:
English
Printable:
Yes
Category:
Engines (Gasoline)
Last updated / verified
Jun 5, 2025

Models Covered & Key Technical Specifications

KTM 125/200 SX/MXC/EXC Engine Service Manual 1998-2003

Technical reference for 1998-2003 KTM 125/200 SX/MXC/EXC engine configurations. | Series KTM Engine Repair Manual Library-Master

  • Prescribed Scan Resolution: 0.60 mm (0.024 in) establishes the precise gap for spark plugs.
  • Documented Tightening Data: 1.4 mm (0.055 in) for 125 models and 1.6 mm (0.063 in) for 200 models specifies ignition timing BTDC.
  • Core Piston Ring Data: Two plain compression rings are standard for 200cc models to ensure proper sealing.
  • Rated Bore Spacing: 54.25 mm (up to 2000) and 64 mm for 200 models defines the cylinder diameter parameters.
  • Technical Ignition Specs: The pulse generator output signal is measured at 6 volts +/- 1 volt for an accurate reading.
  • Advanced Capacity Specs: The generator charging coil output voltage is rated at 35 volts +/- 5 volts for optimal performance.

Professional Workshop Service Manual & Technical Specifications

Standard Field Assembly Manual: KTM 1998-2003 125/200 SX/MXC/EXC Engine Repair Manual Library-Master

Calibration-Scope: 1998-2003 KTM 125/200 SX/MXC/EXC Engine Engineering-Base: KTM Engine Repair Manual Library-Master Logic Calibration-Scope: Technical Engine Specifications Component Operational-Logic Architecture
Engine Specifications Piston Displacement 124.8 ccm (125) / 193 ccm (200)
Ignition Timing BTDC 1.4 mm (125) / 1.6 mm (200)
Spark Plug Gap Clearance 0.60 mm
Primary Drive Ratio Spur Gears 23:73
Clutch Type Multi-disc Oil Bath Hydraulic Operated
Transmission Speeds Gears 6-Speed Claw Actuated

The manual presents information on engine disassembly, component servicing, and assembly procedures. It details the engine housing, crankshaft, transmission, and ignition system, providing critical data for each. Topics covered include the clutch, oil pump, reed valve housing, and intake flange. Specific sections address piston and cylinder inspection, control flap adjustment, and cylinder head procedures. The manual also documents ignition cover and measuring dimensions, providing essential guidance for maintenance and repair.

Sequentially requiring disassembly procedures, the manual details engine removal and installation. It covers the transmission, shift mechanism, and kickstarter, along with the primary drive and clutch components. Oil pump and reed valve housing procedures are also documented. Specific sections on the clutch cover, piston, and cylinder are included. Adjusting dimensions and control flap settings are detailed. Cylinder head and ignition cover procedures are outlined, along with measurements and mounting the clutch slave cylinder. Filling the gear oil is also covered.

This manual includes comprehensive technical specifications for various KTM models, covering engine and chassis details from 1998 through 2003. It details specifications for the 125 SX, 125 EXC, 125 EGS, 200 SX, 200 MXC, and 200 EXC models, including data on frame, forks, suspension, brakes, tires, fuel tank capacity, and final drive ratios. Additionally, it provides standard adjustments for front and rear suspension and tightening torques for various chassis components. Carburetor settings for different models and conditions are also presented.

FAQ

What is the **exact** engine oil specification for this KTM? keyboard_arrow_down

0.7 L of engine oil 20W-40 is specified for the 125 SX and 200 EXC models, while the 125 EXC and 200 SX models use 0.7 L of gear oil 80W.

Reference the **specific** ignition timing values for these engines. keyboard_arrow_down

Ignition timing is set at 1.4 mm (0.055 in) (16.5°) BTDC for 125 models and 1.6 mm (0.063 in) (17°) BTDC for 200 models.

What are the **designated** spark plug gap settings? keyboard_arrow_down

The spark plug gap is set to 0.60 mm (0.024 in) for all listed 125 and 200 models.

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The download process was seamless, and I received the manual via email almost instantly. The instructions are clear and very detailed, making repairs a breeze! Highly recommend it for anyone with a KTM 125/200.