2000-2003 KTM 250 / 400 / 520 SX / MXC / EXC RACING Engine Service Manual (P/N 3206007-E)
167 Pages • 26.06 MB • Instant, Printable PDF
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
Model Years: 2000–2003
Technical Data:
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Cylinder bore diameter: 89.000–89.025 mm (3.5039–3.5049 in)
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Cylinder head screw torque: 40–50 Nm (30–38 ft.lb)
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Valve stem clearance: 0.12 mm (0.0047 in) cold
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Crankshaft axial clearance: 0.1–0.2 mm (0.0039–0.0078 in)
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Engine oil capacity: 1.25 liters
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Cooling system capacity: 1 liter (40% antifreeze)
KTM Manual Features & Content Preview
- Covers 2000–2003 KTM 250, 400, 450, 520, and 525 SX, MXC, and EXC Racing liquid-cooled 4-stroke engine models
- Official KTM OEM publication (Art.-No. 3206007-E, edition 01/2003a) spanning 167 pages
- Contains 47 exploded-view diagrams and 2 complete wiring schematics
- Incorporates critical technical updates for 2003 clutch, valve spring, camshaft gear, and carburetor specifications not found in the original 2000 basic manual
Engine Service Documentation
Whether you're tackling a complete engine rebuild or just running routine maintenance, having exact factory data on the bench is crucial for any shop's workflow. This service manual provides the essential technical specifications and assembly information needed for KTM's high-performance, liquid-cooled engine line. It breaks down the structural details across the 250, 400, 450, 520, and 525 configurations. Inside, mechanics will find clearly mapped engine lubrication circuits. You'll also get component-level teardown sequences for the cylinder head, crankshaft, and transmission, alongside detailed electrical diagnostic values to speed up your troubleshooting.
Specification Highlights
Accurate tolerances are the backbone of a successful motor rebuild. This documentation delivers the precise torque specs, fluid volumes, and clearance settings required for a thorough assessment. It includes critical timing data and tolerance charts for internal components. For example, cylinder head bolt torque is strictly specified at 40–50 Nm, while crankshaft axial clearance must be maintained between 0.1 and 0.2 mm. Additionally, intake valve clearance is listed at 0.12 mm in the specification table. The coolant system capacity is documented at exactly 1 liter.
For the Suzuki-based electrical setup, the text references static ignition values and generator output thresholds specific to the Kokusan 4K-3A and 4K-3B ignition systems. Because working on high-performance engine internals involves inherent safety risks, always consult a certified motorcycle technician before performing service on this equipment.
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