1999-2003 KTM 250/300/380 SX/MXC/EXC Repair Manual (156 P.)

Technical Scope and Service Data

• Covers 1999–2003 KTM 250, 300, and 380 SX, MXC, and EXC two-stroke motorcycles, focusing on engine, transmission, and electrical sub-systems
• Original OEM publication P/N 3206004-E, updated November 2002
• Contains 56 detailed component-identification diagrams, 6 wiring schematics, 5 torque-specification tables, and 4 troubleshooting flow charts
• Delivered as a direct download the moment payment clears
• Stored against your account so you can retrieve it after a hard-drive loss
• Full-text search finds any part number in seconds
• Suitable for printing individual sections for shop-floor use
• This 153-page manual acts as the primary technical reference for the KTM high-performance single-cylinder engine series documented in the 1999–2003 production run

Engine and Transmission Walkthrough

This factory manual details the service requirements for the 250, 300, and 380 series two-stroke powerplants. The documentation encompasses engine removal, top-end overhaul, and full crankcase disassembly, covering internal components such as the crankshaft, piston and ring tolerances, reed valve housing, and the Twin Valve Control (TVC) exhaust system. Each chapter provides the necessary data to maintain internal parts like the centrifugal timer, water pump assembly, and clutch mechanism.

The transmission section details the assembly of mainshafts and countershafts, documenting necessary tolerances for gear dogs, shift forks, and needle bearings. Assembly sequences for the kickstarter shaft and shift mechanism are provided alongside specific assembly instructions for gear shifts and clutch components. The content remains centered on high-performance engine health and requires professional mechanical knowledge for interpretation.

Specification and Calibration Preview

The manual includes comprehensive tightening-torque tables for all engine-case fasteners, clutch assemblies, and chassis components like swingarm pivots. Electrical reference values are provided for Kokusan and SEM ignition systems, covering pulse generator outputs and primary coil resistance readings. Fluid specifications, such as the 1.3-liter coolant capacity and 15W-50 transmission oil, are explicitly documented to aid in maintaining professional service standards.

Valve clearance for the intake is documented within the 250–380 series specifications. Coolant system capacity for the liquid-cooled engines is specified at 1.3 liters. The SEM K11 ignition coil secondary resistance is documented at 1.7 k-ohms in the electrical data section.

Reference only — always consult a certified technician before performing service on this equipment. This official 153-page OEM workshop manual provides full engine, electrical, and transmission specifications for the 1999–2003 KTM 250, 300, and 380 SX, MXC, and EXC models.