Target Audience:
Adult ATV owners performing routine maintenance, pre-ride checks, and basic servicing on the Grizzly 660
Usage Class:
Recreational and utility 4x4 ATV
Class Rivals:
Polaris Sportsman 500/700, Honda Rubicon 500, Suzuki Vinson 500
Key Advantage:
Largest engine in its class at introduction, with Yamaha Ultramatic continuously variable transmission and On-Command 2WD/4WD
Engine:
660cc liquid-cooled single-cylinder four-stroke
Transmission:
Ultramatic CVT with hi/lo range and reverse
Drive System:
On-Command push-button 2WD/4WD
Brakes:
Dual hydraulic disc front, sealed drum rear
Manual Type:
Official factory owners manual
Scope:
Owner operation, care, maintenance schedules, and basic inspection procedures
Delivery Method:
Instant digital download
Compatibility:
Printable on standard paper; viewable on PC, tablet, and smartphone
Page Count:
N/A - not specified for this edition
Engine:
Four-stroke single-cylinder engine layout and controls
Fuel System:
Carburetor operation, fuel tank, and fuel valve
Cooling System:
Liquid cooling system and coolant level checks
Transmission:
Ultramatic CVT, gear selector, and drive select lever operation
Drive System:
On-Command 2WD/4WD selector and differential
Electrical:
Battery, fuses, lights, and ignition switch
Brakes:
Front disc and rear drum brake inspection and adjustment
Suspension & Chassis:
A-arm suspension, wheels, tires, and steering
Periodic Maintenance:
Complete factory maintenance interval charts and service checklists
Fluid Service:
Engine oil change, oil filter replacement, and coolant checks
Adjustments:
Throttle free play, cable adjustment, brake adjustment, and chainless driveshaft checks
Inspections:
Pre-operation checks, spark plug inspection, and air filter cleaning
Troubleshooting:
Basic troubleshooting and emergency start-up procedures
Care & Storage:
Cleaning, long-term storage, and transport procedures
Torque Data:
Wheel nut and fastener torque specifications
Depth Level:
Owner-level maintenance and inspection; not a full workshop service manual with teardown procedures
Illustrations:
Factory line diagrams and exploded component views
Specification Tables:
Factory specifications for capacities, pressures, and adjustments
Part Numbers:
Selected wearable and consumable part references for service items
Fluid Capacities:
Engine oil and coolant capacities with recommended grades
Replacement Intervals:
Factory-recommended replacement intervals for filters, plugs, and fluids
Safety:
Riding safety guidelines, warning labels, and load limits
Controls:
Location and function of all controls and indicators
Specifications:
Complete vehicle specification tables
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:
Liquid-cooled 4-stroke SOHC single cylinder
Bore x Stroke:
100.0 mm x 84.0 mm
Cooling:
Liquid-cooled with radiator
Starting System:
Electric start with recoil backup
Fuel Delivery:
Mikuni carburetor
Fuel Tank Capacity:
5.3 US gallons (20 liters)
Recommended Fuel:
Regular unleaded gasoline
Standard Transmission:
Yamaha Ultramatic continuously variable transmission (CVT)
Gear Ranges:
High, low, neutral, reverse, park
Drive Modes:
On-Command push-button 2WD/4WD
Clutch:
Automatic centrifugal, dry-type CVT
Crash Test Ratings:
N/A - ATVs are not crash tested by consumer rating agencies
Brakes:
Dual hydraulic disc front brakes, sealed mechanical drum rear brake
Traction:
Selectable 4WD via On-Command system
Parking:
Parking brake lever and transmission park position
Foot Protection:
Full floorboards with footpegs
Warning Labels:
Factory safety warning and information labels
Speed Limiter:
Adjustable throttle limiter screw
Display:
Digital LCD multifunction display
Indicators:
Speedometer, odometer, trip meter, hour meter, gear position, and 4WD indicator
Warning System:
Reverse indicator light and coolant temperature warning
Audio System:
N/A - not equipped on this model
Assistance Systems:
N/A - not equipped on this model era
Initial Service:
Break-in check at 1 month or 20 hours of operation
Regular Service:
Periodic checks every 3 months / 50 hours, per factory interval chart
Engine Oil:
Initial change after break-in, then regularly per schedule
Air Filter:
Clean every ride in dusty conditions; replace periodically
Engine Oil:
Yamalube 4-stroke oil or equivalent, SAE 10W-40, API SE or higher
Coolant:
High-quality ethylene glycol antifreeze with corrosion inhibitors
Rear Gear Oil:
SAE 80 API GL-4 hypoid gear oil
Known Issues & Wear Items
Common Wear:
CVT drive belt, brake pads, spark plug, and air filter element
Service Notes:
Inspect CVT intake ducts and driveshaft boots regularly; keep radiator fins clear of mud
Manufacturer:
Yamaha Motor Co., Ltd., founded 1955 in Iwata, Japan
ATV Heritage:
Yamaha introduced its first ATV, the Tri-Moto YTM200, in the early 1980s and became a leader in four-wheel ATVs
Grizzly Origins:
The Grizzly line debuted in 1998 with the 600; the 660 replaced it for 2002 with a larger engine
2002 Update:
New 660cc engine derived from the Raptor 660, with Ultramatic CVT and On-Command 4WD carried over as signature features
Production Location:
Yamaha Motor Manufacturing Corporation, Newnan, Georgia, USA