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Introduction
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Market Position
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Market Segment:
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High-performance sport ATV, known for its power, handling, and aggressive styling.
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Competitive Analysis
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Competitors:
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Competed against other 600cc+ sport ATVs like the Suzuki LT-Z400, Honda TRX400EX, and Polaris Predator 500 during its production run.
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Key Features
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Key Features:
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Powerful 660cc engine, robust chassis, independent front suspension, strong braking performance, and rider-focused ergonomics.
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Manual Value
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Value Proposition:
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An essential resource for owners and technicians seeking to maintain, repair, and optimize the Yamaha YFM660R Raptor, ensuring peak performance and longevity.
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Manual Coverage
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Systems Covered
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Engine:
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Comprehensive coverage of the 660cc liquid-cooled, four-stroke, SOHC, four-valve engine, including disassembly, assembly, inspection, and repair of all internal components.
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Fuel Injection:
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Detailed procedures for the EFI system, including fuel pump, injectors, throttle body, sensors (TPS, MAP, IAT, ECT), ECU, and troubleshooting diagnostic codes.
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Cooling System:
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Maintenance and repair of the liquid cooling system, including radiator, water pump, thermostat, coolant types, and bleeding procedures.
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Chassis:
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In-depth coverage of the frame, suspension (front and rear A-arms, shocks, linkages), steering system, hubs, and bearings.
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Electrical:
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Complete electrical system diagnosis, including wiring diagrams, battery, starter, alternator, ignition system, lighting, and accessory circuits.
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Procedures Included
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Maintenance:
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Scheduled maintenance, fluid changes, filter replacements, lubrication points, and general upkeep.
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Repair:
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Step-by-step repair procedures for all major components, from engine rebuilds to suspension component replacement.
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Troubleshooting:
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Systematic approach to diagnosing and resolving common and complex issues, with specific flowcharts and symptom-based solutions.
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Technical Depth
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Depth:
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Provides a high level of technical detail suitable for professional technicians and advanced DIY enthusiasts, covering internal component specifications and tolerances.
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Navigation
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Navigation Features:
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Bookmarked chapters for quick access to specific repair services, numbered instructions, and bold figured numbers to match illustrations.
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Illustrations
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Illustration Types:
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Detailed illustrations, exploded diagrams, drawings, and photographs for all service and repair procedures.
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Engine Specifications
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Primary Engine
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Engine Type:
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Liquid-cooled, four-stroke, DOHC, 5-valve, single-cylinder
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Displacement:
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660cc
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Bore X Stroke:
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100.0 mm x 84.0 mm
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Compression Ratio:
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9.2:1
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Performance
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Horsepower:
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Approx. 40-45 hp (Varies by specific model year and tuning)
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Torque:
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Approx. 40-45 lb-ft (Varies by specific model year and tuning)
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Fuel System
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Fuel Delivery:
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Mikuni BSR42 carburetor (Early models) / Electronic Fuel Injection (EFI) system (Later models, YFM660RN typically EFI)
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Ignition
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Ignition System:
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TCI (Transistor Controlled Ignition)
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Starting
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Starting System:
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Electric Start
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Lubrication
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Lubrication System:
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Wet Sump (with oil cooler)
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Maintenance
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Service Intervals
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Oil Change Interval:
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Every 20 hours or 3 months (whichever comes first), recommend checking manual for precise details.
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Air Filter Cleaning:
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Every 10 hours or 1 month (depending on riding conditions).
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Spark Plug Inspection:
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Every 20 hours or 6 months.
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Fluid Specifications
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Engine Oil Type:
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Yamaha Genuine Oil 10W-40 or Yamalube 4 (SAE 10W-40) for 4-stroke engines. (Check manual for specific API classification and viscosity)
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Coolant Type:
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Ethylene glycol-based antifreeze mixed with distilled water (50:50 ratio). Refer to manual for specific Yamaha coolant recommendations.
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Brake Fluid:
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DOT 3 or DOT 4 hydraulic brake fluid.
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Known Issues
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Common Issues:
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While generally robust, some common areas of attention can include wear on the starter clutch, potential for carburetor issues (on non-EFI models), and typical wear items like bearings and bushings due to performance riding.
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Maintenance Recommendations:
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Regularly cleaning and inspecting the air filter, ensuring proper chain tension, and checking brake pad wear are crucial for longevity.
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