2000-2003 KTM 250 / 400 / 520 SX / MXC / EXC RACING Engine Service Manual

KTM two-stroke engine service documentation with cylinder head gasket, crankshaft bearing, and transmission repair procedures. Nikasil coating specifications, valve clearance adjustments, and timing chain tensioner data. Part number 3206007-E

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KTM Models Covered & Key Technical Specifications

Models: KTM 250 SX, KTM 400 SX, KTM 450 SX, KTM 520 SX, KTM 525 SX, KTM 250 MXC, KTM 400 MXC, KTM 450 MXC, KTM 520 MXC, KTM 525 MXC, KTM 250 EXC, KTM 400 EXC, KTM 450 EXC, KTM 520 EXC, KTM 525 EXC
Sub-models / Variants: 250, 400, 450, 520, 525, Racing, SX, MXC, EXC
Build Years: 2000–2003
Technical Data:

  • Cylinder bore diameter: 89.000–89.025 mm (3.5039–3.5049 in)
  • Cylinder head screw torque: 40–50 Nm (30–38 ft.lb)
  • Valve stem clearance: 0.12 mm (0.0047 in) cold
  • Crankshaft axial clearance: 0.1–0.2 mm (0.0039–0.0078 in)
  • Engine oil capacity: 1.25 liters
  • Cooling system capacity: 1 liter (40% antifreeze)
Technical Specifications
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Document Number / Seller:
25366 / Donna Gomez
File Size:
26.06 MB
File Type:
PDF
Language:
English
Pages:
167
Printable:
Yes
Category:
Gasoline-Engines
Last updated / verified
Sep 13, 2025

KTM Manual Features & Content Preview

KTM 250–525 SX, MXC, EXC Racing Technical Scope

  • Covers 2000–2003 KTM 250, 400, 450, 520, and 525 SX, MXC, and EXC Racing liquid-cooled 4-stroke engine models
  • Official KTM publication Art.-No. 3206007-E, edition 01/2003
  • Contains 47 exploded-view diagrams and 2 complete wiring schematics
  • 167-page searchable PDF layout optimized for standard letter and A4 printing
  • Delivered as a direct download the moment payment clears
  • Indexed PDF search covers every chapter and appendix
  • Permanent availability in your purchase account — no re-buy required
  • This edition incorporates technical updates for 2003 clutch, valve spring, camshaft gear, and carburetor specifications not found in the original 2000 basic manual

Engine Service Documentation

This 167-page KTM 250–525 SX, MXC, EXC Racing service manual provides technical data and assembly information for the high-performance liquid-cooled engine line. The text outlines structural details for the 250, 400, 450, 520, and 525 configurations, including engine lubrication circuits, component-level dismounting sequences for the cylinder head, crankshaft, and transmission, and detailed electrical system diagnostic values.

Specification Highlights

This KTM 250–525 SX, MXC, EXC Racing publication details torque specifications, fluid volumes, and clearance settings essential for engine assessment. The workshop manual includes timing data and tolerance charts for internal components. Cylinder head bolt torque values are specified at 40–50 Nm. Crankshaft axial clearance is documented at 0.1–0.2 mm. Valve clearance for the intake is listed at 0.12 mm in the specification table. Coolant system capacity is documented at 1 liter. The Suzuki-based electrical system references static ignition values and generator output thresholds for Kokusan 4K-3A and 4K-3B ignition systems. Note: Reference only — always consult a certified technician before performing service on this equipment. This official KTM OEM engine manual provides detailed disassembly, assembly, and technical specifications for the 2000–2003 250–525 SX, MXC, and EXC Racing range, including critical 2003 model-year modifications.

Manual FAQ, Purchase & Download Details

Are wiring diagrams and connector references included in the electrical sections for the racing engines? keyboard_arrow_down

Chapter 11 contains wiring diagrams, while other sections may list electrical reference values to help describe the system configuration.

Does this repair manual provide updated technical information for the 2003 model year engine variants compared to earlier editions? keyboard_arrow_down

Yes, the document includes specific updates for the 2003 model year, such as modifications to the clutch, valve springs, and carburetor. These details are outlined in the explanation of updates provided on the introductory pages.

Can this manual be used to locate information regarding the engine disassembly, assembly, and maintenance schedules for the 250 through 525 racing series? keyboard_arrow_down

Document contains dedicated chapters for servicing individual components, engine disassembly, and engine assembly procedures. It also provides a periodic maintenance schedule to assist with understanding the coverage for these systems.

Is there a reference for fluid capacities or lubricant specifications within the document? keyboard_arrow_down

Technical specifications and general information sections list fluid capacities, such as engine oil volume, and reference the required lubricant types for the engine and hydraulic systems.

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