Segment Focus:
High-performance motocross racing
Target Audience:
Motocross racers, performance enthusiasts, mechanics
Competitors:
Yamaha YZ450F, Honda CRF450R, Kawasaki KX450F, Suzuki RM-Z450
Factory Replica Distinction:
Highlights performance upgrades and specific components found on factory race bikes
Diagnostic Emphasis:
Focus on identifying and rectifying performance-related issues
Engine:
Complete engine assembly, disassembly, and overhaul
Transmission:
Gearbox, clutch, shifting mechanisms
Fuel System:
Fuel injection system (EFI), throttle body, fuel pump, injectors
Electrical System:
Ignition system, charging system, lighting, ECU, wiring diagrams
Suspension:
Front forks (WP), rear shock absorber (WP), linkages
Brakes:
Front and rear brake systems, master cylinders, calipers, discs, fluid bleeding
Chassis And Frame:
Frame, subframe, swingarm, steering head bearings
Cooling System:
Radiator, hoses, water pump
Exhaust System:
Muffler, header pipe
Bodywork And Plastics:
Fairings, seat, fuel tank, fenders
Maintenance:
Regular service, oil changes, filter replacements, chain adjustment, spark plug replacement
Troubleshooting:
Diagnostic procedures for common and uncommon issues
Repair:
Component-level repair and replacement for all major systems
Rebuilds:
Engine and suspension component rebuild procedures
Specifications:
Torque specifications, clearances, fluid capacities, electrical values
Depth:
Comprehensive; suitable for professional mechanics and experienced DIY enthusiasts
Detail Level:
Step-by-step instructions with detailed diagrams and illustrations
Engine Type:
Single-cylinder, 4-stroke, SOHC, LC4 engine
Bore X Stroke:
97 mm x 60.8 mm
Compression Ratio:
12.5:1
Cooling System:
Liquid-cooled
Estimated Horsepower:
Approx. 54-56 HP (stock)
Estimated Torque:
Approx. 32-34 lb-ft (stock)
Fuel Delivery:
Electronic Fuel Injection (EFI) with Keihin 44mm throttle body
Fuel Type:
Unleaded gasoline, minimum 95 octane
Engine Oil Type:
High-performance synthetic motorcycle oil (e.g., Motorex Power Synth 4T 10W/50)
Oil Capacity W Filter:
1.1 Liters (1.2 US qt)
Type:
5-speed constant mesh gearbox
Clutch Type:
Wet multi-disc clutch (hydraulically operated)
Shift Pattern:
1-N-2-3-4-5
Transmission Oil Type:
High-performance synthetic motorcycle gear oil (e.g., Motorex Gear Oil 75W/90)
Transmission Oil Capacity:
0.8 Liters (0.85 US qt)
Crash Test Ratings:
N/A (Motorcycle segment does not have standardized crash test ratings like automobiles)
Braking System:
Hydraulic disc brakes (Brembo calipers front and rear)
Front Brake Disc Size:
260 mm
Rear Brake Disc Size:
220 mm
Frame Construction:
Chromium-molybdenum steel trellis frame
Handlebars:
Renthal tapered aluminum handlebar
Oil Change Interval:
Every 15-20 hours of operation (racing conditions) or annually
Air Filter Cleaning:
After every few rides, especially in dusty conditions
Spark Plug Replacement:
Every 30-50 hours of operation
Valve Clearance Check:
Every 20-30 hours of operation
Chain Lubrication And Adjustment:
Regularly (before or after every ride)
Coolant Type:
Ethylene glycol based coolant (e.g., Motorex Coolant M3.0)
Brake Fluid Type:
DOT 4 brake fluid
Common Wear Items:
Clutch plates, piston rings, valve guides, wheel bearings due to high stress
Suspension Maintenance:
Regular fork seal and oil service is crucial for optimal performance
Brand Origin:
Austria, founded 1934
Motorsport Focus:
Strong heritage and extensive involvement in motorsports, especially off-road and MotoGP
Sx Series Introduction:
KTM's SX series represents their dedicated motocross racing platform
450 Sx F Development:
Continuously updated to incorporate the latest racing technology and performance enhancements
Factory Replica Concept:
Represents a higher specification model with components often found on official KTM factory race bikes
Manufacturing Location:
Austria