2000-2005 KTM 250-525 EXC SX MXC Racing Motorcycle Service Manual
KTM Models Covered & Key Technical Specifications
Models: 250 EXC, 400 EXC, 450 SX, 450 MXC, 450 EXC, 525 SX, 525 MXC, 525 EXC, 525 MXC-G, 525 EXC-G
Sub-models / Variants: Racing, Desert Racing, Sixdays, 2-stroke, 4-stroke
Model Years: 2000–2005
Technical Data:
- Engine: Liquid-cooled single cylinder 4-stroke engine with balancer shaft
- Engine Displacement: 250 cc, 398 cc, 449 cc, 448 cc, 510 cc
- Transmission: 4-speed or 6-speed claw shifted
- Clutch: Multi-disc clutch in oil bath
- Lubrication System: Pressure circulation with two rotor pumps
- Fuel System: Keihin FCR-MX carburetor series
- Ignition: Contactless DC-CDI with digital advanced system by KOKUSAN
- Cooling System: Liquid cooled with mechanically driven water pump
KTM Manual Features & Content Preview
- Covers 2000–2005 KTM 250 EXC, 400 EXC, 450 SX/MXC/EXC, and 525 SX/MXC/EXC Racing motorcycles equipped with liquid-cooled 4-stroke single-cylinder engines
- Official KTM factory publication P/N 3.206.023-E (updated edition 07/2004) serving as the final service reference for this multi-year model range
- Contains 410 pages detailing system diagnostics, chassis setup, and routine maintenance schedules
- Includes 64 pages dedicated exclusively to comprehensive wiring diagrams and technical information bulletins
Workshop Coverage
This factory manual outlines complete servicing protocols for the KTM 250–525 Racing series. It breaks down critical procedures into in-depth chapters focusing on both chassis and engine care. You will find extensive documentation detailing full engine disassembly and assembly, precise valve timing, carburetor tuning, and cooling system maintenance. Rather than guessing specifications during a rebuild, mechanics have immediate access to factory-approved electrical schematics and routine inspection tables to streamline everyday workshop tasks. Always review factory safety guidelines before beginning any teardown, ensuring your workspace is properly ventilated and secure to prevent injury or equipment damage.
Specification Highlights
Precise torque values and fluid capacities are crucial for proper engine maintenance. This guide documents an engine oil capacity of 1.25 liters, recommending Motorex Power Synt 4T 10W/50. Factory torque specs are clearly outlined throughout the publication: engine mounting bolts require 60 Nm, the rear axle collar nut is specified at 80 Nm, and cylinder head bolts demand 40/50 Nm. For valvetrain servicing, intake valve clearance is firmly set at 0.12 mm. Additionally, the cooling system holds 1 liter and requires a minimum 40% antifreeze mixture. Note that this overview describes the contents of the official KTM publication and provides essential technical reference data, rather than serving as a step-by-step repair tutorial.
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