Category:
Motocross Competition Bike
Segment:
High-Performance 4-Stroke Motocross
Key Competitors:
Yamaha YZ450F, Honda CRF450R, Kawasaki KX450F, Suzuki RM-Z450
Engine Layout:
Single-cylinder, 4-stroke, SOHC
Suspension Brand:
WP Suspension (USD front forks, Monoshock rear)
Frame Type:
Chromium-molybdenum steel trellis frame
Primary Focus:
Complete Service and Repair
Additional Coverage:
Troubleshooting, Maintenance, Diagnostics
Estimated Pages:
Approx. 300-400 (Typical for this type of manual)
Type:
Workshop Service Repair Manual
Engine:
Complete engine overhaul, internal components, lubrication, cooling, fuel injection, ignition
Transmission:
Gearbox assembly, clutch, shifting mechanism
Chassis:
Frame, subframe, swingarm, linkages
Suspension:
Front forks (WP Suspension), rear shock absorber (WP Suspension), seals, bushings, oil levels, valving
Brakes:
Front and rear brake systems, master cylinders, calipers, lines, pads, fluid replacement
Wheels Tires:
Front and rear wheel assembly, hubs, spokes, bearings, tire changing, balancing
Fuel System:
Fuel tank, fuel pump, injectors, fuel filter
Exhaust System:
Exhaust header, muffler, heat shields
Electrical System:
Ignition system, battery, charging system, lighting, starter motor, wiring diagrams
Controls:
Throttle, clutch lever, brake lever, shifter, footpegs
Bodywork:
Seat, fuel tank cover, side panels, fenders, triple clamps
Maintenance:
Scheduled maintenance, oil changes, filter replacements, chain adjustment, valve clearance checks
Troubleshooting:
Diagnostic procedures for common faults and issues
Repair:
Detailed step-by-step repair instructions for all major components
Disassembly Assembly:
Complete instructions for component removal and installation
Rebuilds:
Engine and suspension component rebuild procedures
Wiring Diagrams:
Comprehensive electrical system schematics
Depth:
Comprehensive (from basic maintenance to complete engine rebuilds and advanced diagnostics)
Diagnostic Level:
Advanced diagnostic codes and troubleshooting trees
Engine Type:
4-Stroke Single Cylinder
Displacement:
449.3 cc (27.4 cubic inches)
Bore X Stroke:
97.0 mm x 60.8 mm (3.82 in x 2.39 in)
Compression Ratio:
12.5:1
Valve Train:
SOHC, 4 valves
Cooling System:
Liquid-cooled
Horsepower:
Approx. 53 hp (at crankshaft, manufacturer estimate)
Torque:
Approx. 32 lb-ft (at crankshaft, manufacturer estimate)
Fuel Delivery:
Keihin FCR 41 MX Carburetor
Fuel Type:
Unleaded gasoline, minimum 91 octane
Ignition System:
Digital CDI
Oil Type:
Motorex Power Synt 4T 10W-50 (or equivalent JASO MA certified 4-stroke motorcycle oil)
Oil Capacity:
Approx. 1.1 L (1.2 US qt) without filter change; 1.2 L (1.3 US qt) with filter change
Transmission Type:
5-Speed Manual
Clutch Type:
Wet Multi-disc Clutch (Hydraulic actuation)
Gear Ratios:
Refer to manual for specific gear ratios (e.g., 1st: 2.333, 2nd: 1.700, 3rd: 1.333, 4th: 1.100, 5th: 0.909)
Final Drive:
Chain Drive (520 O-ring type)
Transmission Oil Type:
Motorex Gear Oil 80W (or equivalent SAE 80W motorcycle gear oil)
Transmission Oil Capacity:
Approx. 0.8 L (0.85 US qt)
Wheelbase:
Approx. 1470 mm (57.87 inches)
Seat Height:
Approx. 990 mm (38.98 inches)
Ground Clearance:
Approx. 375 mm (14.76 inches)
Dry Weight:
Approx. 106.5 kg (234.8 lbs)
Fuel Tank Capacity:
7.5 L (1.98 US gal)
Front Wheel Size:
21 x 1.60
Rear Wheel Size:
19 x 1.85
Front Tire Size:
80/100-21
Rear Tire Size:
110/90-19
Wheel Bolt Pattern:
N/A (Spoked wheels with axle fitment)
Features:
N/A (Pure motocross machine, no infotainment features)
Features:
N/A (No electronic driver assistance systems)
Features:
N/A (No connectivity features)
Efi System:
N/A (Uses Keihin FCR 41 MX carburetor, not EFI)
Oil Change Interval:
Every 15-20 operating hours (under racing conditions) or as recommended in manual.
Air Filter Cleaning:
After every ride or as needed, depending on conditions.
Valve Clearance Check:
Every 30-40 operating hours.
Chain Lubrication Adjustment:
Every 5-10 operating hours.
Engine Oil Spec:
Motorex Power Synt 4T 10W-50 (JASO MA)
Transmission Oil Spec:
Motorex Gear Oil 80W
Coolant Spec:
KTM Coolant (or a high-quality ethylene glycol-based coolant with corrosion inhibitors)
Brake Fluid Spec:
DOT 4 Brake Fluid
Common Wear Items:
Clutch plates, wheel bearings, steering head bearings, suspension seals, brake pads, spark plugs.
Engine Considerations:
Regular valve adjustments and proper oil changes are critical for longevity due to high-stress operation.
Suspension Maintenance:
Regular fork seal and oil changes are recommended to maintain optimal damping performance.
Brand Focus:
KTM is renowned for its off-road and motorsport heritage, particularly in motocross and rally racing.
Sx Series:
The SX-F line represents KTM's flagship 4-stroke motocross platform, consistently updated with performance and technology advancements.
2010 Updates:
The 2010 model saw refinements including updated WP suspension settings and chassis geometry for improved handling and feedback.
Manufacturing Location:
Mattighofen, Austria (KTM Factory)
Motocross Performance:
KTM 450 SX-F models consistently receive high praise and win numerous championships in professional motocross racing.
Industry Reviews:
Praised for its potent engine, agile handling, and high-quality WP suspension components.
Manual Quality:
Authored by experienced technicians, providing factory-level accuracy and detail.
