Segment:
Performance Sport ATV
Target Audience:
Enthusiasts, Racers, Mechanics, Owners undertaking DIY repairs
Competitors:
Honda TRX450R, Suzuki LT-R450, Bombardier DS450
Vehicle Highlight:
High-performance sport ATV known for its powerful engine and agile handling.
Manual Value Proposition:
Provides expert-level technical guidance to maintain, diagnose, and repair the YFZ450 S efficiently and effectively.
Primary Coverage:
Factory Service Repair
Secondary Coverage:
Maintenance, Diagnostics, Rebuild, Restoration
Page Quality:
High Quality
Type:
Service Manual / Repair Manual
Delivery Format:
Instant Download PDF
Software Requirements:
Adobe PDF Reader or compatible, WinRAR (if archived)
Printing Capability:
Printable with no restrictions
Engine:
Complete Engine Overhaul, Rebuild, Diagnostics, Tuning
Cooling System:
Radiator, Fan, Coolant, Hoses, Pump
Fuel System:
Carburetor Service, Jetting, Fuel Lines, Filter
Drivetrain:
Clutch, Transmission, Final Drive, Chain
Chassis:
Frame, Suspension (Front & Rear), Steering, Swingarm
Electrical:
Ignition System, Lighting, Battery, CDI, Wiring Harnesses
Brakes:
Front & Rear Brake Systems, Calipers, Rotors, Master Cylinders, Lines
Bodywork:
Body Panels, Plastics, Seat, Handlebars
Maintenance:
Scheduled Maintenance, Lubrication, Filter Changes, Adjustments
Troubleshooting:
Diagnostic Flowcharts, Common Issues, Symptom Analysis
Repair:
Step-by-Step Repair Procedures for all covered systems
Rebuild:
Complete Engine and Component Rebuild Instructions
Restoration:
Guidance for bringing the ATV back to original specifications
Depth:
Comprehensive Factory-Level Technical Information
Diagnostics:
Detailed Diagnostic Procedures and Troubleshooting Guides
Illustrations:
Detailed Illustrations and Diagrams for clarity
Engine Type:
Liquid-cooled, 4-stroke, DOHC, 5-valve, Single Cylinder
Bore X Stroke:
95.0 mm x 63.4 mm
Compression Ratio:
11.4:1 (Typical, check manual for exact)
Horsepower:
Approximately 40-45 HP (Varies by model year and tuning, check manual)
Torque:
Estimated 40 Nm (Check manual for exact)
Carburetor Type:
Mikuni BSR37 (Pilot jet, main jet, needle, and jet needle specifications covered in manual)
Fuel Type:
Unleaded gasoline (Regular grade, typically 87 octane or higher)
Ignition Type:
TCI (Transistor Controlled Ignition)
Type:
Forced air cooling with radiator
Length:
Approx. 1,830 mm (72.0 in)
Width:
Approx. 1,215 mm (47.8 in)
Height:
Approx. 1,075 mm (42.3 in)
Wheelbase:
Approx. 1,270 mm (50.0 in)
Dry Weight:
Approx. 170 kg (375 lbs)
Fuel Capacity:
Approx. 10.0 L (2.6 US gal)
Oil Capacity:
Approx. 1.4 L (1.5 US qt) for engine/transmission combined (check manual)
Front Suspension Type:
Independent double wishbone with adjustable shocks
Rear Suspension Type:
Swingarm with adjustable shock
Front Tire Size:
AT21x7R-10 (Manual will specify ply rating and brand recommendations)
Rear Tire Size:
AT20x10R-9 (Manual will specify ply rating and brand recommendations)
Front Brake Type:
Dual hydraulic disc
Rear Brake Type:
Single hydraulic disc
Atv Safety Standards:
Adheres to relevant industry safety standards (ANSI, etc., manual may reference)
Throttle Limiter:
Typically none for performance ATVs; emphasis on rider skill.
Handlebar Design:
Standard ATV handlebars with handguards (often aftermarket)
Oil Change Interval:
Refer to manual: typically every 10-15 operating hours or annually, whichever comes first.
Air Filter Cleaning:
Refer to manual: recommend checking after every few rides, especially in dusty conditions.
Spark Plug Replacement:
Refer to manual: typically around 3,000-5,000 km or 20-30 operating hours.
Engine Oil Type:
Yamalube 4T API SG, SAE 10W-30 (or equivalent - manual provides exact specification).
Coolant Type:
Ethylene glycol-based antifreeze with demineralized water (50:50 mix recommended, check manual).
Brake Fluid Type:
DOT 4 hydraulic brake fluid (check manual for confirmation).
Common Wear Items:
Chain and sprockets, wheel bearings, brake pads, tires.
Engine Considerations:
Carburetor tuning can be critical for optimal performance; valve adjustments are routine maintenance.
Electrical Notes:
While generally reliable, stator and CDI issues can occur over time; manual aids in diagnosis.
Yamaha Atv Legacy:
Yamaha has a long and successful history in ATV manufacturing, known for performance and reliability.
Yfz450 Introduction:
The YFZ450 was introduced as a flagship performance ATV, quickly becoming a dominant force in racing.
Yfz450S Specifics:
The 'S' designation often refers to specific trim levels or slight variations within the YFZ450 line, though core components remain consistent across these years.
Manufacturing Location:
Primarily Japan, with potential assembly in other regions.
