Target Audience:
Raptor 660 owners, DIY mechanics, and service technicians working on the YFM660RN/RNC
Purpose:
Complete repair, service, rebuild, and maintenance reference for home or shop use
Cost Savings:
Perform repairs yourself without paying dealer labor charges
Content Quality:
Comparable to the factory shop manual and official CD-ROM repair manuals
Convenience:
Instant email delivery — no waiting for a CD to arrive by mail
Scope:
General information, specifications, periodic inspection and adjustment, engine, carburetion, chassis, electrical troubleshooting
Printable:
Print all, any, or only the pages you need
Coverage Areas:
General information, specifications, periodic inspection and adjustment, engine, carburetion, chassis, electrical troubleshooting
Manual Type:
Repair and service manual (factory shop manual style)
File Format:
PDF (Windows and Mac compatible)
Delivery Method:
Instant email delivery / digital download
Printing:
Print all, any, or only the pages you need
General Information & Specifications
General Information:
Vehicle identification, model designation, and safety information
Specifications:
Complete factory specifications tables for all systems
Periodic Inspection & Adjustment
Scheduled Maintenance:
Periodic inspection and adjustment procedures for all major components
Engine Tune-Up:
Valve clearance checks, carburetor adjustment, and idle settings
Drive System:
Clutch and drive chain inspection and adjustment
Brakes:
Brake inspection, pad wear checks, and adjustment
Engine Removal & Installation:
Step-by-step engine removal and refitting procedures
Cylinder Head:
Disassembly, inspection, and service of the cylinder head and valves
Cylinder & Piston:
Cylinder, piston, and piston ring inspection and rebuild procedures
Crankshaft & Balancer:
Crankshaft and balancer service and measurement specifications
Oil System:
Lubrication system inspection and oil pump service
Carburetor Service:
Complete disassembly, cleaning, and rebuild of the YFM660 carburetor
Fuel System:
Fuel tank, petcock, and fuel line inspection and service
Throttle:
Throttle cable and twist throttle adjustment
Suspension:
Front suspension and rear swingarm/knock axle service and setup
Steering:
Steering stem and tie-rod inspection and adjustment
Wheels & Tires:
Wheel and tire service specifications
Final Drive:
Drive chain, sprockets, and rear axle service
Electrical Components:
Ignition, charging, and starter system testing and repair
Wiring Diagrams:
Full wiring schematics for electrical troubleshooting
Electrical Troubleshooting:
Systematic diagnostic procedures with connector and resistance checks
Torque Specifications:
Fastener torque values throughout the manual
Parts Information:
Component identification and exploded-view style references for ordering parts
Technical Depth:
Written for full teardown and rebuild work, not just basic owner maintenance
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 single-cylinder 4-stroke, liquid-cooled, SOHC 4-valve
Bore x Stroke:
100.0 mm x 84.0 mm
Compression Ratio:
9.2 : 1
Cooling:
Liquid-cooled with radiator and cooling fan
Carburetor:
Mikuni BSR 33 mm constant-velocity carburetor
Starting System:
Electric start with recoil backup
Ignition:
DC-CDI ignition system
Lubrication:
Wet sump oil system
Standard Transmission:
5-speed manual constant-mesh gearbox
Clutch:
Wet, multi-plate manual clutch with left-side actuation
Final Drive:
Chain drive to rear axle
Optional Transmission:
N/A - the Raptor 660 was offered with a single transmission configuration
Features:
Manual clutch override for throttle fault conditions
Crash Test Ratings:
N/A - ATVs are not crash tested under passenger-vehicle rating programs
Certification:
Meets ANSI/SVIA 1-2001 ATV standard (2001-2005 model years)
Brakes:
Dual hydraulic disc brakes (front), hydraulic disc rear brake
Throttle Override:
Throttle override system (clutch) to cut power if throttle sticks
Parking Brake:
Parking brake lock on the brake lever
Rider Protection:
Footpegs with aggressive tread and engine skid protection
Lighting:
Dual headlights and integrated taillight/brake light
Audio System:
N/A - ATVs of this era carry no audio or infotainment system
Instrumentation & Electronics
Instrument Cluster:
Speedometer and indicator warning lights
Ignition:
DC-CDI electronic ignition with electric starter
Lighting:
30W dual halogen headlights
Driver Assistance:
N/A - no electronic rider-assistance systems on this model
Engine Oil:
Initial change at 1 month / 200 km, then every 6 months / 2,000 km
Oil Filter:
Replace with each oil change
Valve Clearance:
Check every 6 months / 2,000 km
Air Filter:
Clean every ride period, replace as needed — critical in dusty riding
Drive Chain:
Lubricate and check slack before every ride
Engine Oil:
SAE 10W-40 API SE or higher 4-stroke motor oil
Engine Oil Capacity:
Approx. 1.6 L with filter change
Coolant:
High-quality ethylene glycol antifreeze mixed with soft water
Brake Fluid:
DOT 4 brake fluid
Known Issues / Common Wear
Valve Clearance:
Raptor 660s are known to lose valve clearance with use — regular checks prevent top-end damage
Oil Delivery:
Keep oil changes current; cam/rockers are sensitive to oil starvation
Carburetor:
BSR carburetor can need re-jetting for altitude; drains should be used before storage
Common Wear Items:
Drive chain/sprockets, brake pads, and air filter element
Manufacturer:
Yamaha Motor Company, founded 1955 and a leading Japanese powersports manufacturer
Sport ATV Lineage:
Raptor line continues from the Banshee and Warrior sport quads
Introduction:
YFM660R Raptor launched in 2001 as Yamaha's high-performance 660cc sport ATV
Production:
Produced 2001 through 2005, then succeeded by the fuel-injected Raptor 700
Engine Heritage:
Engine architecture shared with the Raptor-based 660 grizzly/racing single family
Production Location:
Manufactured in Japan by Yamaha Motor Company