🏷️ Basic Information Identification Make: Yamaha Model: YFM660FP Grizzly Year: 2001 Vehicle Type: ATV (All-Terrain Vehicle) Engine Code Designator: YFM660FP 👋 Introduction Market Position Market Position: The Yamaha YFM660FP Grizzly was a high-performance, utility-focused ATV renowned for its robust engine and capable off-road performance. This manual targets owners and technicians seeking to maintain and repair this model. Key Features Key Features Of Manual: Comprehensive coverage, detailed diagnostics, step-by-step repair guidance, rich illustration library, and critical safety information for the 2001 Yamaha YFM660FP Grizzly. Value Proposition Value For Buyers: Empowers owners to perform essential maintenance and complex repairs themselves, saving on labor costs and ensuring optimal performance and longevity of their ATV. 📋 Manual Details Coverage Coverage Areas: General Information, Periodic Maintenance, Fuel System (DFI), Cooling System, Engine Top End, Clutch, Engine Lubrication System, Engine Removal/Installation, Crankshaft/Transmission, Wheels/Tyres, Final Drive, Brakes, Suspension, Steering, Frame, Electrical System, Appendix Pages Page Count: 408 Type Manual Type: Service Repair Manual Language Language: English Format File Format: PDF Delivery File Delivery: Instant Download 📖 Manual Coverage Systems Systems Covered: Engine (top end, lubrication, cooling, fuel injection), Drivetrain (clutch, transmission, final drive, driveshafts), Chassis (suspension, steering, brakes, frame, wheels, tires), Electrical System (ignition, lighting, starting, charging, sensors), Bodywork (panels, guards, seating, racks) Procedures Procedures Included: Routine maintenance, troubleshooting, detailed repair procedures, component removal and installation, adjustment specifications, overhaul instructions, torque specifications, diagnostic procedures, wiring diagrams Depth Technical Depth: Comprehensive (covers everything from basic adjustments to complete engine and drivetrain rebuilds, including electrical diagnostics) 📊 Manual Specifications File Characteristics File Format Quality: High-resolution PDF, optimized for printing and digital viewing Printable Pages: Yes, all 408 pages are printable Features Navigation Features: Bookmarked chapters for quick access, numbered table of contents Instructional Elements: Numbered step-by-step instructions, bold figured numbers for illustration matching, notes, cautions, and warnings Illustrations: Detailed illustrations, exploded diagrams, drawings, and photos ⚙️ Engine Specifications Primary Engine Engine Type: Liquid-cooled, 4-stroke, SOHC, 5-valve, single-cylinder Displacement: 660 cc Bore X Stroke: 100.0 mm x 84.0 mm (estimated from similar models and common bore sizes) Compression Ratio: 9.1:1 (typical for this era and configuration) Fuel System Fuel Delivery: Electronic Fuel Injection (DFI - Digital Fuel Control) Fuel Type: Unleaded gasoline Ignition Ignition System: TC (Transistor Controlled) Ignition Lubrication Lubrication System: Wet sump with oil cooler Performance Estimated Horsepower: Approx. 45-50 HP (actual figures vary and are not explicitly stated in the provided info, but this is a typical range for this displacement and engine design) Estimated Torque: Approx. 40-45 lb-ft (estimated) Cooling Cooling System: Liquid cooling with radiator and fan 🔧 Transmission Drivetrain Transmission Type: Automatic (V-belt type) Drive System: Shaft drive, selectable 4WD with locking front differential Features Gear Reduction: High and Low range, Neutral, Reverse 📐 Dimensions Weights Dry Weight: Approx. 622 lbs (282 kg) (as per Yamaha specifications for the YFM660FG model, which is closely related) Capacities Fuel Tank Capacity: Approx. 4.2 US gal (16 L) (typical for this model) Oil Capacity: Approx. 2.5 US qt (2.4 L) with oil filter change (refer to manual for exact specifications) 🛡️ Safety Features Active Features Braking System: Hydraulic disc brakes (front and rear) Passive Features Lighting: Dual 30W headlights, 30/30W taillight/brake light 💡 Technology Features Drivetrain Features Cv Shaft Boots: Durable, but inspection for tears and damage is crucial, as detailed in the manual. Fuel System Dti Components: Includes throttle body, fuel injectors, ECU, and various sensors. The manual covers troubleshooting and repair of these DFI components. Electrical System Charging System: Stator and rectifier/regulator system. Manual provides testing procedures. Starting System: Electric starter and potentially a recoil backup (manual details starter motor testing). 🔧 Maintenance Service Intervals Oil Change Interval: Refer to manual, typically every 1000 miles or 6 months (suggested based on common ATV practices) Spark Plug Maintenance: Inspect and gap every 1000 miles (refer to manual for specific plug type and gap) Fluid Specifications Engine Oil Grade: Yamalube 4 (or equivalent SAE 10W-30 or 20W-40 depending on ambient temperature, as per manual) Coolant Type: Permanent antifreeze (ethylene glycol based) mixed with distilled water (50:50 ratio) Known Issues Common Wear Items: Brake pads, tires, wheel bearings, drive belts (CVT), spark plugs, air filter. Potential Engine Issues: Valve adjustment, occasional issues with fuel injection components if not maintained. The manual details diagnosis and repair for these. 📚 Vehicle History Brand Heritage Brand Heritage Atv: Yamaha has a long-standing reputation for building reliable and high-performance ATVs, pioneering many advancements in the industry. Model Evolution Model Evolution Grizzly: The 660cc Grizzly was a significant step up from earlier models, offering more power and torque, and establishing Yamaha's dominance in the utility ATV segment.