Model:
125 SX, 200 SX, 125 MXC, 200 MXC, 125 EXC, 200 EXC
Chassis Code Prefix:
Various depending on specific model (e.g., SX, EXC, MXC)
Engine Code Prefix:
Various depending on specific model and displacement
Category:
Competition Motorcycles (Motocross, Enduro, Cross-Country)
Target Demographic:
Enthusiast riders, racers, and off-road recreational users
Key Competitors:
Yamaha YZ125, Honda CR125R, Suzuki RM125, Kawasaki KX125; similar displacement models from other European manufacturers
Vehicle Characteristics:
Lightweight, agile, potent 2-stroke engines, high-performance suspension, designed for demanding off-road conditions
Manual Value Proposition:
Provides in-depth knowledge for maintaining peak performance and ensuring longevity of these specialized off-road machines
Primary Coverage:
Complete service, repair, and maintenance for KTM 125/200 SX, MXC, EXC models
Secondary Coverage:
Troubleshooting, diagnostics, specifications, and overhaul procedures
Estimated Page Count:
Likely 300-500 pages (typical for comprehensive service manuals of this era)
Type:
Service and Repair Manual
Target Audience:
Professional technicians and experienced DIY mechanics
Engine:
Complete engine disassembly, assembly, tuning, lubrication, cooling system, fuel system (carburetor), exhaust system
Transmission:
Gearbox disassembly, assembly, inspection, clutch operation, lubrication
Chassis And Frame:
Frame inspection, swingarm, linkage, bearings, headstock bearings
Suspension:
Front fork (WP) servicing, rear shock absorber (WP) servicing, adjustments, seal replacement
Brakes:
Front and rear brake system maintenance, bleeding, caliper service, pad replacement, master cylinder service
Electrical System:
Ignition system, lighting, wiring diagrams, charging system, battery maintenance
Fuel System:
Carburetor (likely Keihin or Mikuni) disassembly, cleaning, jetting, fuel tank, petcock
Cooling System:
Radiator, hoses, coolant specifications, thermostat (if applicable)
Exhaust System:
Exhaust pipe and silencer maintenance, repacking (for 2-stroke expansion chambers)
Routine Maintenance:
Oil changes, filter replacements, chain adjustment, spark plug inspection/replacement, air filter cleaning
Major Overhaul:
Top-end rebuild (piston, rings, cylinder), bottom-end rebuild (crankshaft, bearings), gearbox overhaul
Troubleshooting:
Diagnosis of common problems, fault finding charts
Component Replacement:
Step-by-step guides for replacing various parts and sub-assemblies
Suspension Tuning:
Sag adjustment, compression and rebound damping adjustments
Carburetor Tuning:
Jetting procedures, idle speed adjustment, mixture screw settings
Depth:
Comprehensive, covering everything from basic checks to complete engine and transmission rebuilds
Diagnostic Capabilities:
Detailed troubleshooting guides, wiring diagrams, component testing procedures
Special Tools:
Identification of required special tools for specific procedures
Type:
2-stroke, single-cylinder
Displacement 125:
124.8 cc
Bore Stroke 125:
54 mm x 54.5 mm (approximate)
Bore Stroke 200:
62.5 mm x 65 mm (approximate)
Power Delivery:
Aggressive, high-revving powerband characteristic of 2-stroke performance engines
Horsepower 125:
Approximately 30-35 HP (varies by model and tuning)
Horsepower 200:
Approximately 38-42 HP (varies by model and tuning)
Carburetor Type:
Likely Keihin PWK or Mikuni VM series (specific size varies by model)
Fuel Type:
Unleaded gasoline (91-98 RON), mixed with 2-stroke oil
Mixing Ratio:
Typically 1:30 to 1:50 (oil:fuel), refer to manual for exact specification
Oil Change Frequency:
Every 10-15 hours of riding or annually, refer to manual for specific conditions.
Air Filter Cleaning:
After every few rides or more frequently in dusty conditions, as per manual.
Spark Plug Inspection:
Every 10-20 hours of riding, check for fouling and correct gap.
Top End Rebuild:
Recommended every 30-60 hours of riding for optimal performance, or as indicated by symptoms.
Transmission Oil Change:
Every 20-30 hours of riding or annually.
Engine Oil Type:
2-stroke premix oil (e.g., Motorex, Castrol - specific grade per manual)
Cooling System Coolant:
Ethylene glycol based antifreeze/coolant mixture (50/50 ratio with distilled water is typical)
Fork Oil Type:
Specific fork oil viscosity (e.g., SAE 5W or 7.5W), capacity and level must be strictly adhered to as per manual.
Brake Fluid Type:
DOT 4 or DOT 5.1 hydraulic brake fluid (confirm with manual).
Common Wear Items:
Piston rings, clutch plates, wheel bearings, steering head bearings, swingarm/linkage bearings, spark plugs, power valve components.
Carburetor Tuning Challenges:
Sensitivity to jetting changes based on altitude, temperature, and humidity; requires precise setup.
Suspension Maintenance:
Regular fork seal and oil changes are crucial for maintaining performance and preventing leaks.