2000-2007 KTM 250 EXC, 400 SX, 450 MXC, 525 SX, 610 RACING Service Manual

Technical Scope of the 2000–2007 KTM 250–610 Racing Service Manual

• Covers the 2000–2007 KTM 250 EXC, 400 SX, 450 MXC, 525 SX, and 610 Racing engine series, including various trim variants like the SMR, SXS, XC, and XC-W
• Official KTM publication Art.-Nr. 3.206.043-E, updated for the 2007 model year build
• Contains 245 pages of factory-level technical specifications, exploded-view diagrams, and electrical system schematics for the liquid-cooled 4-stroke engine range
• Delivered as a direct download the moment payment clears
• Indexed PDF search covers every chapter and appendix
• Detailed engine overhaul and component servicing documentation
• This specific version provides the complete 2000–2007 cross-reference updating instructions for the loose-leaf format, making it the definitive reference for the full production run of the Racing engine series.

Engine and Maintenance Overview

This KTM 250–610 Racing service manual outlines the maintenance and mechanical assembly required for the high-performance liquid-cooled single-cylinder engines. The document provides detailed insight into the lubrication circuit, including internal oil flow paths through long and short filters and the bypass valve function. Maintenance chapters describe standard practices for servicing the hydraulic clutch system, cooling circuits, and fuel system, alongside rigorous specifications for checking piston fitting clearances and valve train tolerances. The technical data provided ensures that the engine is maintained to factory standards using original manufacturer parts.

Technical Specifications and Electrical Reference

This manual documents torque values for critical engine bolts and clearances for internal components such as crankshaft journals and conrod bearings. The electrical section details diagnostic procedures for the KOKUSAN contactless DC-CDI ignition system, stator testing, and charging voltage thresholds. Reference tables list values for primary and secondary coil resistance, as well as timing values for various 4K ignition models. Valve clearance for the intake and exhaust is specified at 0.12 mm in the cylinder head assembly table. Coolant capacity for the 250–610 Racing engine series is approximately 0.8 liters. The stator output is documented at 12V 40W for electrical system support.

Note: This document is an overview for the 2000–2007 KTM 250–610 Racing models and serves as a technical reference guide for qualified mechanics performing factory-authorized engine work.

An official 245-page KTM OEM service manual covering the 2000–2007 250–610 Racing engine range, documenting engine disassembly, assembly, cooling, electrical, and fuel-injection specifications for the high-performance single-cylinder architecture.

Document Reference: Art.-Nr. 3.206.043-E, Edition 01/2007