🏷️ Basic Information Identification Make: Yamaha Model: YFM660FS Grizzly Model Designation: FS (Four-Stroke, SOHC) Generation Generation Designation: First Generation Grizzly 660 Codes Chassis Code: YFM660FS 👋 Introduction Market Position Category: High-performance All-Terrain Vehicle (ATV) Target Audience: Outdoor enthusiasts, hunters, farmers, recreational riders requiring a robust and capable off-road machine. Competitive Analysis Competitors: Honda Foreman, Suzuki King Quad, Polaris Sportsman, Kawasaki Prairie. Key Features Engine Type: Liquid-cooled, 4-stroke, SOHC, 5-valve, single-cylinder Drive System: Ultramatic automatic transmission with On-Command 2WD/4WD and differential lock. Suspension: Independent front and rear suspension for superior ride comfort and terrain handling. Braking: Sealed hydraulic disc brakes front and rear. 📋 Manual Details Coverage Areas Years Covered: 2002, 2003, 2004, 2005 Page Count Total Pages: 508 Manual Type Manual Type: Workshop Service Manual / Repair Manual Language Language: English Format File Format: PDF 📖 Manual Coverage Systems Covered Engine: Complete overhaul, maintenance, diagnostics, cooling system, lubrication system, fuel system, ignition system, exhaust system, carburetor adjustment and overhaul, internal engine components (piston, rings, crankshaft, cylinder head, valves). Transmission: Automatic transmission (CVT), clutch operation, belt inspection and replacement, gearbox maintenance, final drive system, differential. Chassis And Suspension: Frame inspection, front and rear suspension systems (shocks, springs, A-arms), steering system (handlebars, tie rods, rack and pinion), wheel bearings, lubrication points. Brakes: Hydraulic brake system, front and rear brake calipers, brake discs, brake pads, brake fluid specifications and bleeding procedures, parking brake system. Electrical System: Wiring diagrams, battery maintenance, starter motor, charging system (stator, regulator/rectifier), lighting system (headlights, taillights, indicators), ignition system components, switches, sensors, fuses, troubleshooting electrical faults. Bodywork And Controls: Body panel removal and installation, seat, fenders, racks, controls (throttle, brake levers, shifter), cable adjustments, fluid reservoirs. Procedures Included Maintenance: Scheduled maintenance intervals, oil and filter changes, air filter cleaning/replacement, spark plug replacement, valve clearance adjustment, drive belt inspection, lubrication. Troubleshooting: Systematic diagnostic procedures for common and uncommon issues, fault codes (if applicable), diagnostic flowcharts. Repair: Detailed step-by-step instructions for disassembly, repair, and reassembly of all major components and systems. Overhaul: Comprehensive guidance for complete engine, transmission, and major component rebuilds. Technical Depth Depth: Comprehensive, covering everything from basic rider maintenance to complete engine and transmission rebuilds. Includes detailed torque specifications, clearances, and diagnostic procedures. 📊 Manual Specifications File Format File Format Detail: Searchable PDF for efficient information retrieval, printable pages. Print Quality Image Resolution: High resolution for clear diagrams and text. Binding Type Binding Type: N/A (Digital PDF download) Paper Type Paper Type: N/A (Digital PDF download) ⚙️ Engine Specifications Primary Engine Engine Type: 5-valve SOHC, single cylinder, liquid-cooled, 4-stroke Displacement: 660 cc Bore X Stroke: 95.0 mm x 93.2 mm Compression Ratio: 9.2:1 Performance Horsepower Estimate: Approximately 45-50 HP (varies by region and tuning) Torque Estimate: Approximately 40-45 ft-lbs (varies by region and tuning) Fuel System Carburetor: Mikuni BSR42 (single) Fuel Type: Unleaded gasoline (minimum 87 octane) Lubrication System Oil Type: Yamaha Genuine 4-stroke motor oil or equivalent SAE 10W-40 API SG or higher. Oil Capacity: 2.40 L (2.54 US qt) without filter change, 2.50 L (2.64 US qt) with filter change. Cooling System Coolant Type: Ethylene glycol based antifreeze mixed 50/50 with distilled water. Coolant Capacity: 1.90 L (2.01 US qt) 🔧 Transmission Standard Transmission Type: Yamaha Ultramatic V-belt automatic transmission Drive Modes: 2WD, 4WD, 4WD with differential lock (On-Command system) Optional Optional Transmissions: N/A (All models equipped with Ultramatic CVT) Features Features: Engine braking control, automatic centrifugal clutch, durable V-belt system. Maintenance Drive Belt Inspection Interval: Every 1,000 km or 6 months, whichever comes first. Gear Oil Type: Yamalube Gear Oil or equivalent SAE 80 API GL-4. Gear Oil Capacity: 0.25 L (0.26 US qt) 📐 Dimensions Exterior Overall Length: 2,003 mm (78.9 in) Overall Width: 1,079 mm (42.5 in) Overall Height: 1,067 mm (42.0 in) Wheelbase: 1,231 mm (48.5 in) Ground Clearance: 260 mm (10.2 in) Weights Wet Weight: 272 kg (599.7 lbs) Fuel Capacity: 17 L (4.5 US gal) Cargo Front Rack Capacity: 45 kg (99 lbs) Rear Rack Capacity: 85 kg (187 lbs) Wheels And Tires Front Tire Size: AT25x8-12 Rear Tire Size: AT25x10-12 Front Wheel Size: 12 x M6.0 Rear Wheel Size: 12 x M8.0 Bolt Pattern: 4 x 110 mm 🛡️ Safety Features Ratings Atv Safety Classification: Not Applicable (ATVs are not typically rated by NCAP or IIHS) Active Features Active Safety: On-Command 4WD with differential lock for enhanced traction, engine braking from Ultramatic transmission. Passive Features Passive Safety: Ergonomic design for rider control, sturdy frame construction, handlebar padding, integrated floorboards with traction pegs. Braking System Front Brake Type: Dual sealed hydraulic disc Rear Brake Type: Sealed hydraulic disc 💡 Technology Features Infotainment Infotainment System: N/A (Basic utility vehicle, no integrated infotainment system) Driver Assistance Driver Assistance Features: N/A Connectivity Connectivity Features: N/A Lighting Headlights: Dual 30W halogen bulbs Taillight Brake Light: 15W/5W bulb 🔧 Maintenance Service Intervals Engine Oil Change:...