Segment:
High-performance motocross competition motorcycle.
Target Audience:
Motocross racers and serious off-road enthusiasts.
Competitors:
Yamaha YZ450F, Honda CRF450R, Suzuki RM-Z450, Kawasaki KX450F.
Engine Design:
Liquid-cooled, SOHC, four-valve, single-cylinder engine.
Chassis Technology:
Lightweight chromoly steel frame, WP suspension components.
Handling:
Renowned for agile handling and precise feedback.
Braking System:
High-performance Brembo hydraulic disc brakes.
Engine:
Full engine disassembly, assembly, inspection, and component servicing (pistons, rings, valves, camshaft, crankshaft, bearings).
Fuel System:
Fuel injection system (throttle body, injectors, fuel pump, pressure regulator), fuel tank, and lines.
Cooling System:
Radiator, coolant hoses, water pump, thermostat, and fluid specifications.
Transmission Drivetrain:
Gearbox disassembly, inspection, and assembly; clutch operation and servicing; final drive chain and sprockets.
Suspension Front:
WP Suspension (forks) - disassembly, seal replacement, fluid type and level, spring rates, damping adjustments.
Suspension Rear:
WP Suspension (shock absorber) - disassembly, seal replacement, fluid type and level, linkage maintenance, spring adjustments.
Brakes Front:
Brembo hydraulic system - caliper service, master cylinder overhaul, pad replacement, bleeding procedures, fluid specifications.
Brakes Rear:
Brembo hydraulic system - caliper service, master cylinder overhaul, pad replacement, bleeding procedures, fluid specifications.
Electrical System:
Ignition system, starter motor, battery, charging system (stator, rectifier/regulator), wiring diagrams, lighting, switchgear.
Exhaust System:
Exhaust pipe and muffler removal, inspection, and installation.
Frame Chassis:
Frame inspection, steering head bearing maintenance, swingarm bearing service, footpeg and control lever adjustments.
Wheels Tires:
Wheel bearing maintenance, spoke tensioning, tire replacement and mounting, recommended tire pressures.
Maintenance:
Scheduled maintenance tasks, oil changes, filter replacements, chain adjustment, spark plug checks, air filter cleaning.
Troubleshooting:
Systematic diagnostic flowcharts for common performance issues, starting problems, and operational faults.
Repair:
Detailed step-by-step instructions for component replacement and repair.
Disassembly Assembly:
Complete guides for dismantling and reassembling major motorcycle components.
Torque Specifications:
Critical torque values for all fasteners and critical components.
Wiring Diagrams:
Comprehensive electrical schematics for easy diagnosis and repair.
Depth:
Comprehensive, covering all aspects from basic maintenance to complete engine and chassis rebuilds.
Diagnostic Capabilities:
Advanced diagnostic procedures and symptom-based troubleshooting.
Special Tools:
Identification and usage of specific tools required for certain procedures.
Engine Type:
Single-cylinder, 4-stroke
Displacement:
449.3 cc (27.43 cubic inches)
Bore X Stroke:
97.0 mm x 60.8 mm (3.82 in x 2.39 in)
Valve Train:
SOHC, 4 valves
Compression Ratio:
12.8:1 (approximate)
Lubrication System:
Pressurized lubrication with separate oil chambers (engine and clutch/gearbox).
Cooling System:
Liquid-cooled
Horsepower:
Estimated 54-56 HP at peak (varies with tuning and exhaust)
Torque:
Estimated 32-34 lb-ft at peak (varies with tuning and exhaust)
Fuel Delivery:
Electronic Fuel Injection (EFI) with Keihin throttle body.
Fuel Type:
Unleaded gasoline, minimum 95 RON (91 AKI).
Engine Oil Change:
Every 15 hours of operation or as specified by manual (e.g., after race events).
Air Filter Cleaning:
Every 5-10 hours, or more frequently in dusty conditions.
Spark Plug Inspection:
Every 20-30 hours.
Valve Clearance Check:
Every 40-50 hours.
Chain Lubrication Adjustment:
Every 5-10 hours, or after washing/riding in wet conditions.
Engine Oil:
Motorex Power Synt 4T SAE 10W/50 (or equivalent high-quality motorcycle specific 4-stroke engine oil with JASO MA certification).
Cooling Fluid:
KTM Coolant Protect C (or equivalent ethylene glycol-based coolant with corrosion inhibitors, mixed 50/50 with distilled water).
Brake Fluid:
DOT 4 or DOT 5.1 brake fluid.
Fork Oil:
WP Suspension Fluid 0W (or equivalent high-quality suspension fluid with correct viscosity, e.g., Motul Factory Line 0W).
Common Wear Items:
Clutch plates, wheel bearings, steering head bearings, brake pads, piston rings, spark plugs.
Suspension Maintenance:
Regular fork seal and shock absorber rebuilds are critical for optimal performance.
Engine Performance Tips:
Proper air filter maintenance and timely oil changes are crucial for engine longevity.