Model:
Raptor 660 (YFM660R)
Model Variants Covered:
Raptor 660R and Raptor L.E. / L-Edition (YFM660RP, YFM660RP_B, YFM660RPB, YFM660RR, YFM660RLER, YFM660RS, YFM660RLES, YFM660RT, YFM660RSET)
Production Years Covered:
2002, 2003, 2004, 2005
Vehicle Type:
Sport all-terrain vehicle (ATV)
Target Audience:
Sport ATV riders and recreational owners seeking high-performance trail and dune machines
Segment:
Mid-to-large displacement sport quad class
Advantage:
Strong low-end and midrange torque from a large single-cylinder four-stroke, wide aftermarket support, and proven durability
Rivals of the Era:
Honda 400EX, Suzuki LTZ400, Kawasaki KFX400, Polaris Predator 500
Engine:
660cc liquid-cooled single-cylinder four-stroke derived from the Grizzly 660
Suspension:
Independent double wishbone front with rear swingarm
Braking:
Dual front hydraulic disc brakes with rear hydraulic disc
Delivery Method:
Instant digital download
Software Required:
None - any standard PDF viewer
Devices Supported:
Computer, tablet, or smartphone; file saved permanently after download
Manual Type:
Factory-style service and repair manual
Coverage Scope:
Complete vehicle: maintenance, troubleshooting, and full repair procedures
Page Count:
N/A - not specified for this model
Chapter Openers:
Each chapter starts with system illustration, diagrams, exploded parts views, pictures, service information, and troubleshooting
Procedure Style:
Detailed step-by-step removal and installation instructions
General Information:
Vehicle identification, model specifications, and general service data
Specifications:
Complete factory specification tables for all systems
Maintenance and Adjustments:
Scheduled service, lubrication, adjustments, and inspection points
Fuel System:
Carburetor service, throttle, and fuel delivery
Cooling System:
Radiator, coolant, water pump, and thermostat service
Engine:
Complete teardown, inspection, and rebuild of the 660cc powerplant
Chassis:
Frame, suspension, steering, wheels, and brakes
Electrical:
Charging, ignition, starting, and lighting circuits
Wiring Diagrams:
Full-color schematics for each model year
Removal and Installation:
Step-by-step component removal and installation for the entire vehicle
Disassembly and Assembly:
Engine and chassis teardown and reassembly sequences
Inspection and Measurement:
Wear limits, clearances, and measuring procedures
Troubleshooting:
Systematic diagnostic charts for engine, electrical, and chassis faults
Torque Specifications:
Factory torque values for fasteners throughout the vehicle
Tune-Up:
Carburetor adjustment, valve clearance, and ignition timing checks
Brake Service:
Pad, disc, caliper, and master cylinder overhaul
Suspension Service:
Shock, a-arm, and swingarm bushing replacement
Electrical Testing:
Component test procedures with voltage and resistance values
Technical Depth and Parts
Illustrations:
System illustrations, diagrams, exploded parts views, and photographs in every chapter
Parts Information:
Exploded views with factory part identification for reference
Skill Level:
Suitable for professional technicians and competent DIY owners
Applies To:
All chapters apply to the whole vehicle and all covered model variants
File Format:
PDF (searchable, bookmarked, zoomable)
Compatibility:
Windows, macOS, Linux, iOS, and Android — any device with a PDF reader
Requirements:
A PDF reader application (e.g. Adobe Acrobat Reader, free)
Searchability:
Fully text searchable for fast lookup of any topic
Print Quality:
High-resolution digital pages, printable at full clarity
Binding Type:
N/A — digital download, no physical binding
Paper Type:
N/A — digital download, no physical paper
Engine Type:
660cc liquid-cooled four-stroke single-cylinder SOHC
Bore x Stroke:
100.0 mm x 84.0 mm
Carburetor:
Mikuni BSR33 constant-velocity
Starting System:
Electric start with auxiliary recoil
Approximate Horsepower:
Around 40 hp at the crank
Cooling:
Liquid-cooled with radiator and fan
Rated Output Details:
N/A - not specified for this model
Fuel Delivery:
Carbureted (non-fuel-injected)
Fuel Type:
Regular unleaded gasoline
Fuel Tank Capacity:
Approximately 3.5 gallons
Wheelbase:
Approximately 49.0 inches
Overall Length:
Approximately 72.8 inches
Overall Width:
Approximately 43.3 inches
Overall Height:
Approximately 44.3 inches
Ground Clearance:
Approximately 8.9 inches
Curb Weight:
Approximately 398 lbs
Fuel Capacity:
Approximately 3.5 gallons
Exact Figures:
N/A - exact factory figures not specified for this model
Crash Test Ratings:
N/A - ATVs are not subject to crash test ratings
Regulatory Compliance:
Built to ANSI/SVIA 1-2001 ATV standards
Active and Passive Features
Front Brakes:
Dual hydraulic disc brakes
Rear Brakes:
Hydraulic disc brake
Kill Switch:
Engine stop switch on handlebar
Passive Restraints:
N/A - not applicable to ATVs
Rider Recommendation:
Helmet, eye protection, and protective gear recommended per Yamaha operator guidelines
Instrumentation and Audio
Instrument Cluster:
Digital LCD display with speedometer, odometer, and indicator lights
Audio System:
N/A - not equipped on this model
Driver Assistance Features:
N/A - not applicable to this ATV
Lighting:
Dual front headlights with rear taillight
Electric Start:
Standard push-button starting
Engine Oil:
Replace initial at 1 month (or 200 km), then every 6 months (or 1,600 km)
Oil Filter:
Replace initial at 1 month, then every 12 months (or 3,200 km)
Valve Clearance:
Check initially at 1 month, then every 6 months (or 1,600 km)
Air Filter:
Clean every 1,280 km, replace as needed; more often in dusty conditions
Spark Plug:
Inspect and clean every 6 months; replace per service schedule
Engine Oil:
Yamalube 4 or equivalent SAE 10W-40 API SE or higher (JASO MA)
Oil Capacity:
Approximately 1.5 liters at oil change
Coolant:
High-quality ethylene glycol antifreeze mixed with soft water
Chain Lubricant:
Chain lubricant suitable for O-ring chains
Known Issues and Wear Items
Common Wear Items:
Air filter, brake pads, chain, sprockets, and swingarm bushings
Known Issues:
Carburetor tuning sensitivity and valve clearance drift on high-mileage engines; swingarm and shock bushings wear with hard use
Reference:
Manual's Troubleshooting chapter covers diagnosis of these and other faults
Manufacturer:
Yamaha Motor Company, founded 1955, Japan
ATV Heritage:
Yamaha pioneered sport ATVs with the Banshee and Warrior before the Raptor line
Introduction:
Raptor 660 introduced in 2001 as Yamaha's flagship sport ATV
2002-2005 Updates:
Minor running changes; L.E. and L-Edition appearance packages offered in several years
Successor:
Replaced by the Raptor 700 after the 2005 model year
Assembly:
Yamaha production facilities in Japan