Model Variant:
YFZ450RZL, YFZ450RAL, YFZ450RSEA, YFZ450XAL, YFZ450XSEA, YFZ450R, YFZ450X
Years Covered By Manual:
2009, 2010, 2011, 2012
Related Models Mentioned:
YFZ450 (2004-2009)
Engine Code Family:
450cc, liquid-cooled, DOHC, 5-valve, fuel-injected
Target Segment:
Performance-oriented sport ATV segment, racing and recreational use.
Key Competitors Segment:
Honda TRX450R, Suzuki LT-R450, Kawasaki KFX450R.
Performance Focus:
High-performance, agile handling, powerful engine.
Value Proposition:
Direct access to professional-grade repair information, instant download, cost-effective alternative to physical manuals or dealership service.
Engine Mechanical:
Engine assembly, disassembly, overhaul, lubrication, cooling system, fuel system (injection, pump, injectors), ignition system, starting system.
Drivetrain:
Transmission, clutch, final drive, driveshaft, gearbox, differential (if applicable).
Chassis And Suspension:
Frame, front and rear suspension, shocks, swingarm, steering system, hubs, wheels, tires.
Brakes:
Hydraulic brake system, calipers, master cylinders, brake lines, rotors, brake pads, parking brake.
Electrical:
Wiring diagrams, battery, charging system, lighting, ignition, ECU, sensors, switches, starter motor.
Bodywork And Controls:
Handlebars, controls, seating, body panels, fenders, storage, footpegs.
Maintenance Procedures:
Scheduled maintenance, oil changes, filter replacements, chain adjustment, valve clearance checks, spark plug replacement, battery maintenance.
Troubleshooting:
Diagnostic procedures, fault code interpretation, common problems and solutions.
Repair Procedures:
Step-by-step instructions for component removal, installation, rebuilding, and adjustment.
Special Tools:
Identification and usage of specialized tools required for specific repairs.
Depth:
Comprehensive, covering routine maintenance to complete engine and transmission rebuilds, advanced diagnostics, and electrical system troubleshooting.
File Type:
PDF (Adobe Acrobat)
Searchability:
Likely searchable text content due to PDF format
Printability:
Printable for shop use
Digital Format Advantage:
No physical binding required; printable copy can be created
Digital Format Advantage:
No paper type specified as it's a digital download
Engine Type:
Liquid-cooled, 4-stroke, DOHC, 5-valve
Bore X Stroke:
95.0 mm x 63.1 mm
Compression Ratio:
11.2:1 (typical)
Horsepower:
Estimated 48-52 HP (at crankshaft, depending on specific year/tuning)
Torque:
Not explicitly stated, but high torque output for its class
Fuel Delivery:
Fuel Injection (EFI)
Ignition System:
TCI (Transistor Controlled Ignition)
Oil Type Recommendation:
Yamaha Yamalube 4 (or equivalent 10W-40 or 20W-40 API SG, JASO MA certified)
Cooling Method:
Liquid-cooled
Coolant Type:
Yamaha Genuine Coolant (or equivalent ethylene glycol based anti-freeze with distilled water, 50:50 mix)
Length:
Approx. 1835 mm (72.2 in)
Width:
Approx. 1280 mm (50.4 in)
Height:
Approx. 1040 mm (40.9 in)
Wheelbase:
Approx. 1270 mm (50.0 in)
Dry Weight:
Approx. 177 kg (390 lbs)
Wet Weight:
Not explicitly stated, but typically ~10-20 kg more than dry weight
Fuel Capacity:
10.0 L (2.6 US gal)
Front Suspension Type:
Independent double wishbone with adjustable piggyback shocks
Front Wheel Travel:
Approx. 215 mm (8.5 in)
Rear Suspension Type:
Swingarm with adjustable piggyback shock
Rear Wheel Travel:
Approx. 231 mm (9.1 in)
Front Tire Size:
AT21x7-10
Rear Tire Size:
AT20x10-9
Front Brake Type:
Dual hydraulic disc
Rear Brake Type:
Hydraulic disc
Display Features:
Digital LCD meter displaying speedometer, odometer, trip meter, clock, neutral indicator, and other warning lights.
Efi System:
Electronic Fuel Injection ensures optimal air-fuel mixture for consistent power delivery and throttle response in various conditions.
Diagnostic Port:
Feature for connecting diagnostic tools, allowing for reading fault codes and monitoring sensor data.
Engine Oil Change:
Refer to manual for specific hours/mileage. Typically every 1000 km or 3 months, but off-road use may require more frequent changes.
Air Filter Cleaning:
Frequent cleaning recommended based on operating conditions. Manual will detail procedure and frequency.
Spark Plug Inspection:
Inspect every 1000 km or annually. Replace as needed based on condition.
Valve Clearance Check:
Typically at initial break-in and then every 2000 km or annually. Critical for performance.
Engine Oil Capacity:
Approx. 1.70 L (1.8 US qt) without filter change; 1.80 L (1.9 US qt) with filter change.
Transmission Oil Capacity:
Approx. 0.52 L (0.55 US qt)
Coolant Capacity:
Approx. 1.30 L (1.37 US qt)
Common Wear Items:
Brake pads, tires, chain and sprockets, wheel bearings, suspension bushings, clutch components, depending on usage and maintenance.
Performance Tuning Considerations:
Manual would cover basic tuning parameters for EFI but would not cover aftermarket modifications. Common areas for improvement include exhaust, intake, and ECU remapping.
Yamaha Atv Legacy:
Yamaha has a long history in ATV manufacturing, known for innovation and performance.
Yfz450 Lineage:
The YFZ450R is an evolution of the original YFZ450, featuring fuel injection and updated chassis/suspension for enhanced performance and handling.
Manufacturing Location:
Typically manufactured in Japan and/or USA by Yamaha Motor Corporation.
