Motorcycle Segment:
High-performance Motocross and Cross-Country Competition
Key Competitors:
Yamaha YZ450F, Honda CRF450R, Kawasaki KX450F, Suzuki RM-Z450
Vehicle Design Philosophy:
Lightweight, powerful, and agile for competitive off-road racing, emphasizing performance and rider control.
Manual Value Proposition:
Provides the definitive guide for maintaining and repairing these specialized performance machines, enabling cost savings and optimal performance.
Engine Mechanical:
Complete overhaul, cylinder head, piston, crankshaft, connecting rod, valve train, timing, lubrication system, cooling system.
Fuel System:
Fuel injection system, fuel pump, injectors, throttle body, fuel tank, lines, diagnostics.
Ignition System:
Ignition coil, spark plug, ECU, wiring diagrams, timing adjustments.
Transmission:
Clutch operation, gear shifting mechanisms, internal transmission components, lubrication.
Suspension:
Front fork (WP), rear shock absorber (WP), linkage system, adjustments, rebuild procedures.
Brakes:
Hydraulic brake system (front and rear), master cylinders, calipers, brake lines, pads, rotor specifications, bleeding procedures.
Electrical System:
Wiring diagrams, battery, starter, lighting, sensors, ECU, troubleshooting.
Chassis And Frame:
Frame inspection, subframe, steering head bearings, swingarm, wheel bearings.
Bodywork And Plastics:
Fairings, seat, fuel tank cover, removal, installation, and general care.
Maintenance:
Scheduled maintenance, oil changes, filter replacements, chain adjustment, spark plug replacement, air filter cleaning.
Troubleshooting:
Diagnostic charts, common problems, symptom-based troubleshooting for engine, electrical, and chassis issues.
Repair:
Step-by-step repair instructions for all major components, including complete engine disassembly and reassembly.
Installation:
Installation procedures for replacement parts and accessories.
Diagnostics:
On-board diagnostics (OBD) information where applicable, sensor data interpretation, fault code analysis.
Depth Level:
Comprehensive Factory Level
Target Audience:
DIY enthusiasts and experienced professional mechanics
Engine Type:
Four-stroke, Single Cylinder
450 Sx-F Displacement:
449.3 cc
505 Xc-F Displacement:
505.6 cc
Bore X Stroke 450:
97 mm x 60.8 mm
Bore X Stroke 505:
97 mm x 67.7 mm
Compression Ratio:
11.0:1 (typical for this generation)
Valve Train:
DOHC, 4 Valves
Cooling System:
Liquid-cooled
Lubrication System:
Semi-dry sump, dual oil pumps
450 Sx-F Horsepower:
~53 HP (at crankshaft, estimated)
505 Xc-F Horsepower:
~56 HP (at crankshaft, estimated)
450 Sx-F Torque:
~47 Nm (at crankshaft, estimated)
505 Xc-F Torque:
~50 Nm (at crankshaft, estimated)
Fuel Delivery:
Electronic Fuel Injection (EFI), Keihin 41mm throttle body
Fuel Type:
Unleaded Premium (95-98 RON / 91-93 AKI)
Transmission Type:
5-speed Manual
Optional Transmission:
N/A
Clutch Type:
Wet, multi-disc clutch (Hydraulically operated)
Gear Ratios:
Specific ratios available in manual, typical for motocross application (e.g., 1st: ~2.57, 2nd: ~1.84, 3rd: ~1.40, 4th: ~1.13, 5th: ~0.96)
Oil Change Interval:
Every 10-15 hours of riding (or as per manual recommendation, typically after major race events).
Air Filter Cleaning:
Every 5-8 hours of riding, or more frequently in dusty conditions.
Spark Plug Replacement:
Every 20-30 hours of riding, depending on plug type and usage.
Valve Clearance Check:
Every 20-30 hours of riding for precision motocross engines.
Engine Oil Type:
SAE 10W-50, API SJ or higher, JASO MA/MA2 (e.g., Motorex Power Synt 4T 10W/50).
Engine Oil Capacity:
Approx. 1.1 Liters (1.16 US quarts) with filter change.
Cooling System Coolant:
Mixture of distilled water and antifreeze (ethylene glycol based), typically 50/50 ratio. Coolant spec: JASO M325 / KG-001.
Brake Fluid Type:
DOT 4 hydraulic brake fluid.
Common Wear Items:
Clutch plates, piston rings, valve guides, wheel bearings, steering head bearings, swingarm bearings, chain and sprockets.
Maintenance Criticality:
Due to the high-stress nature of competition, adherence to strict maintenance schedules is paramount for longevity and performance.
Ktm Motorsport Focus:
KTM has a long and successful history in off-road motorcycle racing, particularly in motocross and rally raid, earning the nickname 'Ready to Race'.
2009 Generation:
This generation represented a significant update for KTM's motocross and cross-country platforms, featuring advanced chassis and engine technology.
Sx-F Vs Xc-F:
The SX-F is primarily designed for motocross, while the XC-F is geared towards cross-country racing, often with minor differences in suspension, gearing, or emissions controls for broader usability.
Manufacturing Location:
Austria (KTM AG)
Motocross Championships:
KTM models of this era have achieved numerous national and international motocross and supercross victories, validating their engineering and performance.
Magazine Reviews:
Praised by motorcycle publications for their potent engines, agile handling, and premium componentry (e.g., WP suspension).
Racing Homologation:
Designed and built to meet the demands of professional racing series.