Category:
High-performance utility ATV
Target Audience:
Recreational riders, hunters, farmers, and utility users requiring robust off-road capability.
Competitors Early 2000S:
Polaris Sportsman, Can-Am Outlander, Suzuki King Quad, Honda Foreman/Rancher.
Engine:
Torquey 660cc liquid-cooled, four-stroke SOHC engine.
Drivetrain:
Yamaha's Ultramatic automatic transmission with 2WD/4WD selection and locked front differential.
Suspension:
Independent front and rear suspension for improved comfort and terrain handling.
Braking:
Sealed hydraulic disc brakes on all four wheels.
Engine:
Detailed breakdown of the 660cc engine, including lubrication, cooling, fuel, ignition, and emissions systems.
Transmission:
Coverage of the automatic transmission (CVT), including belt inspection, clutch operation, and gearbox maintenance.
Drivetrain:
In-depth information on the 4x4 system, differentials (front and rear), driveshafts, and wheel hubs.
Suspension:
Front and rear suspension components, including shock absorbers, springs, A-arms, steering knuckles, and bushings.
Brakes:
Disc brake systems (front and rear), including hydraulic lines, calipers, master cylinders, and rotor specifications.
Electrical:
Wiring diagrams, electrical component testing, battery, starter, charging system, lighting, and electronic control units (ECU).
Chassis:
Frame, body panels, seats, handlebars, footrests, and storage components.
Cooling System:
Radiator, fan, hoses, coolant specifications, and flushing procedures.
Fuel System:
Carburetor (Mikuni BSR42), fuel pump, fuel lines, and fuel tank.
Steering:
Steering column, tie rods, ball joints, and related components.
Wheels And Tires:
Wheel specifications, tire pressure recommendations, and replacement procedures.
Routine Maintenance:
Oil changes, filter replacements, spark plug service, air filter cleaning/replacement, chain adjustment (if applicable), lubrication points.
Troubleshooting:
Diagnostic flowcharts and symptom-based troubleshooting for common issues.
Engine Repair:
Top-end and bottom-end engine rebuilds, piston and cylinder inspection, valve clearance adjustment, camshaft installation.
Transmission Overhaul:
CVT belt replacement, clutch component inspection and replacement, gearbox dis assembly and reassembly.
Brake Service:
Brake pad replacement, caliper service, master cylinder overhaul, brake bleeding procedures.
Electrical Diagnostics:
Testing of ignition system, charging system, starter motor, lighting circuits, and ECU diagnostics.
Suspension Repair:
Shock absorber replacement, bushing replacement, ball joint inspection and replacement, steering component service.
Carburetor Tuning:
Carburetor cleaning, adjustment, and synchronization.
Drivetrain Maintenance:
CVT drive belt inspection and replacement, differential oil changes, driveshaft inspection.
Level:
Professional-level diagnostic and repair procedures, suitable for mechanics and experienced DIY enthusiasts.
Detail:
Includes torque specifications, clearances, diagnostic values, and step-by-step instructions with accompanying illustrations.
Engine Type:
Liquid-cooled, four-stroke, SOHC, single-cylinder
Bore X Stroke:
100 mm x 84 mm
Valve Train:
SOHC, 4 valves per cylinder
Horsepower Est:
Approximately 45-50 HP (estimated, factory figures not always published)
Torque Est:
Approximately 38-42 lb-ft (estimated)
Carburetor:
Mikuni BSR42, single, with throttle position sensor (TPS)
Fuel Capacity:
5.1 gallons (19.3 L)
Recommended Fuel:
Unleaded gasoline, 87 octane or higher
Oil Capacity:
2.3 US qt (2.2 L) with filter change
Engine Oil Type:
Yamaha Motorcycle Oil SAE 10W-40 (API SG or higher) or equivalent
Engine Oil Change:
Every 1,000 miles (1600 km) or 6 months, whichever comes first.
Air Filter Cleaning:
Every 6 months or as needed based on operating conditions.
Spark Plug Inspection:
Every 1,000 miles (1600 km) or 6 months.
Transmission Oil Change:
Every 1,000 miles (1600 km) or 6 months.
Cvt Belt Inspection:
Every 6 months (check for wear, cracks, and proper tension).
Engine Oil:
Yamalube 4 SAE 10W-40 API SG or higher
Transmission Oil:
Yamalube 4 SAE 20W-40 API SG or higher
Coolant Type:
Yamaha,'s 50/50 mixture of engine coolant and distilled water, or equivalent ethylene glycol-based coolant.
Cvt Belt Wear:
The CVT belt can wear over time, leading to slippage and reduced performance. Regular inspection and replacement are crucial.
Carburetor Clogging:
Due to ethanol in fuel or debris, the carburetor can become clogged, affecting fuel delivery and engine performance.
Rear Axle Seal Leaks:
Some models have reported leaks from rear axle seals, requiring replacement.
Radiator Fan Failure:
Overheating can occur if the radiator fan malfunctions. Testing and replacement of the fan or its associated components are necessary.
Manufacturer:
Yamaha Motor Corporation is a Japanese multinational corporation known for its wide range of products, including motorcycles, marine products, and musical instruments.
Predecessor:
The Grizzly 600 was the predecessor, with the 660cc model representing a significant power and torque upgrade.
Successor:
The Grizzly 700 FI (Fuel Injection) replaced the 660 model, introducing fuel injection and power steering.
Manufacturing Location:
Primarily manufactured in Japan or through Yamaha's global production facilities.
Production Period:
The 660cc engine variant was produced for several years, with the YFM660FP covering the 2001-2002 model years.