Model:
125 SX, 150 SX, 250 SX, 125 XC, 150 XC, 250 XC
Product Sku Or Part Number:
Likely specific to publisher/distributor, not provided in source
Vehicle Segment:
Competition Motorcycles (Motocross/Off-road)
Target Audience:
Enthusiast riders and racers of KTM's 125cc, 150cc, and 250cc SX (Motocross) and XC (Cross-Country) models.
Key Competitors 2012:
Yamaha YZ125/YZ250, Honda CR125R/CR250R (discontinued but relevant heritage), Suzuki RM125/RM250 (discontinued but relevant heritage), Kawasaki KX125/KX250 (discontinued but relevant heritage), Husqvarna TC/CR models.
Ktm Brand Philosophy:
Performance-oriented, 'Ready to Race' ethos, premium components, advanced chassis design for agility and feedback.
Model Lineup Distinction:
SX models are pure motocross racing machines, while XC models are adapted for cross-country and off-road competition with features like larger fuel tanks and sometimes different suspension tuning.
Systems Covered:
Engine, Chassis, Suspension, Brakes, Electrical System, Fuel System, Cooling System, Exhaust System, Drivetrain, Controls, Maintenance Procedures, Troubleshooting
Approximate Page Count:
Estimated 200-300 pages (typical for this class of owner's manual)
Manual Type:
Owner's Manual
Language:
English (assumed based on typical distribution)
Engine Systems:
2-stroke engine operation, lubrication, cooling, fuel delivery, ignition, starting system, exhaust system components.
Chassis And Suspension:
Frame structure, suspension setup (front and rear), adjustments for rider weight and terrain, wheel and tire information, chain adjustment, steering system.
Braking System:
Hydraulic brake system operation (front and rear), brake fluid type, lever and pedal adjustments, pad wear inspection.
Electrical System:
Lighting, instrumentation, battery maintenance, fuse identification and replacement, basic troubleshooting for electrical issues.
Fuel And Controls:
Fuel tank capacity, fuel type recommendations, carburetor settings (if applicable for 2012 models), clutch and throttle control adjustments.
Routine Maintenance:
Pre-ride inspections, cleaning procedures, chain lubrication and adjustment, air filter cleaning/replacement, spark plug inspection.
Fluid Checks And Changes:
Coolant level checks, transmission oil type and change intervals, brake fluid checks.
Troubleshooting Guide:
Common operational issues and their potential causes and solutions, diagnostic tips.
Suspension Adjustment:
Guidance on adjusting suspension sag, rebound, and compression damping for various riding conditions.
Seasonal Storage:
Recommendations for preparing the motorcycle for extended storage.
Diagnostics:
Basic diagnostic steps for common issues, but not deep diagnostic procedures requiring specialized tools.
Repair Scope:
Covers routine maintenance and adjustments. Major component overhauls or complex repairs would typically be found in a service manual.
Consumer Focus:
Aimed at the end-user to ensure safe and proper operation, regular maintenance, and basic understanding of the motorcycle's systems.
Engine Type:
2-Stroke, Single Cylinder
Engine Displacement 125:
125cc class (exact displacement typically around 124.8 cc)
Engine Displacement 150:
150cc class (exact displacement typically around 144 cc)
Engine Displacement 250:
250cc class (exact displacement typically around 249 cc)
Bore X Stroke 125:
Approximately 54 x 54.5 mm (typical for 125cc 2-strokes of this era)
Bore X Stroke 150:
Approximately 56 x 58.2 mm (typical for 150cc 2-strokes of this era)
Bore X Stroke 250:
Approximately 66.4 x 72 mm (typical for 250cc 2-strokes of this era)
Horsepower Approximate 125:
35-40 HP (estimated, varies by tune and dyno)
Horsepower Approximate 150:
38-43 HP (estimated, varies by tune and dyno)
Horsepower Approximate 250:
45-50 HP (estimated, varies by tune and dyno)
Carburetor Type All:
Keihin PWK 36mm (common for these models)
Fuel Type Recommendation:
High-octane unleaded gasoline (95 RON or higher recommended)
Premix Ratio:
Typically 1:40 or 1:50 with a quality 2-stroke synthetic oil.
Transmission Type:
6-Speed Constant Mesh
Clutch Type:
Wet Multi-Disc Clutch (Hydraulically Actuated)
Gear Ratios:
Specific gear ratios are detailed within the manual, crucial for track setup.
Transmission Oil Type:
SAE 10W/50 or SAE 15W/50 semi-synthetic or fully synthetic engine oil (refer to manual for exact specification, e.g., Motorex)
Wheelbase Approximate:
Around 1470-1480 mm (varies slightly between SX/XC and engine size)
Seat Height Approximate:
Around 970-980 mm (typical for competition dirt bikes)
Dry Weight Approximate 125:
Around 91-92 kg
Dry Weight Approximate 150:
Around 91-92 kg
Dry Weight Approximate 250:
Around 95-96 kg
Fuel Tank Capacity Sx:
Typically 7.0 liters (1.85 US gal) for SX models
Fuel Tank Capacity Xc:
Typically 9.5 liters (2.5 US gal) for XC models
Safety Compliance:
Manufactured to meet relevant off-road competition standards. Not street legal by default.
Braking System Type:
Hydraulic Disc Brakes (Front and Rear), Brembo components often used.
Suspension Features:
High-performance WP Suspension (USD front forks, Monoshock rear) with adjustable compression and rebound damping.
Ergonomics:
Designed for aggressive riding posture, control placement optimized for track use.
Oil Change Interval Transmission:
Every 10-15 hours of riding (refer to manual for exact specification and conditions).
Air Filter Cleaning:
As needed, but frequently recommended every 5-10 hours of riding in dusty conditions.
Spark Plug Inspection:
Every 10-20 hours of riding.
Chain Lubrication And Adjustment:
Every ride, or every 5-10 hours of riding, depending on conditions.
Top End Rebuild Recommendation:
Typically 40-60 hours of riding for piston and rings, depending on riding style and maintenance adherence.
Brake Fluid Type:
DOT 4 Hydraulic Brake Fluid
Coolant Type:
Water-glycol mixture (50/50) with anti-corrosion additives.
Common Wear Items:
Clutch plates, chain and sprockets, brake pads, tires, wheel bearings, pivot bearings (swingarm, linkage, steering head).
2012 Specific Notes:
Some owners reported specific carburetor jetting needs for optimal performance in varied altitudes. Check manual for recommended base settings.
Ktm Offroad Legacy:
KTM has a long and successful history in off-road racing, particularly motocross and enduro, dating back decades.
2012 Model Updates:
The 2012 models typically featured chassis refinements, updated suspension settings, and minor engine tuning improvements over previous years, reflecting KTM's continuous development cycle.
Sx Vs Xc Distinction:
The SX line is focused on AMA Motocross standards, while the XC line is designed for AMA Grand National Cross Country (GNCC) and similar off-road racing disciplines, often featuring softer suspension, larger fuel tanks, and different gearing.
Manufacturing Location:
Austria (Primary)
Motorsport Achievements:
KTM 125/150/250 SX and XC models have consistently been race winners and highly regarded in their respective classes in professional and amateur motocross and off-road racing.
Media Reviews 2012:
Generally received positive reviews from motorcycle publications for their strong engines, agile handling, and premium componentry.
Emissions Standards:
Designed for competition use, may not meet road-going emissions standards.
