Category:
High-performance Motocross/Off-Road Competition Motorcycle.
Key Competitors:
Honda CRF450R, KTM 450 SX-F, Kawasaki KX450F, Suzuki RM-Z450.
Engine Type:
Liquid-cooled, 4-stroke, DOHC, 5-valve, single-cylinder.
Suspension Technology:
Industry-leading KYB SSS (Speed Sensitive System) front forks and KYB rear shock.
Chassis Design:
Lightweight bilateral beam frame for improved rigidity and handling.
Fuel Delivery:
Advanced Electronic Fuel Injection (EFI) system for optimal performance and throttle response.
Engine System:
Complete engine disassembly, assembly, diagnostics, tuning, and component specifications.
Fuel System:
Fuel injection system, throttle body, fuel pump, injectors, troubleshooting and calibration.
Cooling System:
Radiator, water pump, coolant flow, thermostat, maintenance and troubleshooting.
Ignition System:
ECU, ignition coils, spark plug, timing, troubleshooting.
Transmission System:
Clutch, gearbox, shift mechanism, lubrication, maintenance, and repair.
Suspension System:
Front forks (KYB SSS), rear shock absorber (Monoshock), adjustments, rebuild procedures, and specifications.
Braking System:
Front and rear disc brakes, calipers, master cylinders, brake fluid, maintenance, and bleeding procedures.
Electrical System:
Wiring diagrams, lighting, battery, starter, charging system, troubleshooting and component testing.
Frame And Bodywork:
Chassis components, plastics, seat, handlebars, maintenance and repair.
Scheduled Maintenance:
Detailed service intervals for oil changes, filter replacements, valve adjustments, and more.
Troubleshooting Guides:
Systematic diagnostic procedures for common and uncommon issues.
Disassembly And Assembly:
Step-by-step instructions for major component overhauls and replacements.
Torque Specifications:
Precise torque values for all critical fasteners.
Wiring Diagrams:
Comprehensive electrical schematics for easy fault finding.
Special Tool Requirements:
Identification of any specialized tools needed for specific procedures.
Depth Level:
Comprehensive (from basic maintenance to complete engine rebuilds and advanced diagnostics).
Engine Type:
Liquid-cooled, 4-stroke, DOHC, 5-valve, single-cylinder
Bore X Stroke:
95.0 mm x 63.1 mm
Compression Ratio:
12.5:1
Valve Actuation:
DOHC, 5 valves (3 intake, 2 exhaust)
Horsepower Estimated:
Approximately 50-55 HP (at crankshaft)
Torque Estimated:
Approximately 35-40 lb-ft (at crankshaft)
Fuel Delivery:
Fuel Injection, Keihin 44mm throttle body
Fuel Type:
Unleaded gasoline (91 octane or higher recommended)
Oil Type:
Yamalube 4T SAE 10W-40 or equivalent high-performance motorcycle oil.
Oil Capacity With Filter Change:
1.00 L (0.01 US qt, 0.93 Imp qt)
Ignition System:
TCI (Transistor Controlled Ignition)
Spark Plug Type:
NGK CR9E (or equivalent)
Transmission Type:
Constant mesh 5-speed
Clutch Type:
Wet, multi-plate
Gear Ratios:
Specific gear ratios detailed within the manual.
Final Drive:
Chain drive, 520 O-ring type.
Transmission Oil Type:
Yamalube Gear Oil or equivalent SAE 80 API GL-4.
Transmission Oil Capacity:
0.70 L (0.74 US qt, 0.62 Imp qt)
Safety Standard:
Designed for closed-course competition use only; not street legal.
Braking System Type:
Hydraulic dual disc front, Hydraulic single disc rear.
Tires Front:
80/100-21M/C 51P Dunlop Geomax MX51F
Tires Rear:
110/90-19M/C 62M Dunlop Geomax MX51
Frame Construction:
Aluminum bilateral beam frame.
Display Features:
Digital instrument cluster displaying speed, trip meter, clock, and maintenance indicators.
Performance Tuning Capabilities:
The EFI system allows for tuning via aftermarket tuners or manual adjustments outlined in the service manual, impacting engine response and power delivery.
Diagnostic Ports:
Diagnostic connectors for checking system status and error codes.
Engine Oil Change:
Every 10-15 hours of riding or annually, whichever comes first (refer to manual for precise conditions).
Air Filter Cleaning:
After every few rides or as needed depending on riding conditions.
Valve Clearance Check:
Every 20-30 hours of riding or annually.
Coolant Type:
High-quality engine coolant (50% ethylene glycol and 50% distilled water).
Brake Fluid Type:
DOT 4 hydraulic brake fluid.
Common Wear Items:
Clutch plates, brake pads, chain and sprockets, air filter, spark plug.
Potential Performance Enhancements:
While the manual covers stock specifications, it provides the foundation for understanding modifications like ECU remapping or exhaust system changes.
Yamaha Motorsport Legacy:
Yamaha has a long and storied history in professional motocross and off-road racing, consistently developing innovative and race-winning machinery.
Yz450F Development:
The 2013 YZ450F represented a significant evolution, building upon previous generations with chassis refinements, suspension improvements, and continued focus on its powerful engine and competitive handling.
Manufacturing Location:
Japan
