This workshop service repair manual covers the Mongoose/KXR 90/50 All-Terrain Vehicles. These ATVs, manufactured by a Taiwanese powersports company, are designed as entry-level and youth models. They typically feature a 2-stroke, air-cooled, single-cylinder engine with a carburetor and CDI ignition, paired with an automatic CVT transmission and chain drive. Known for their value proposition in the powersports market, these ATVs offer a robust steel tube frame and essential features like headlights and taillights for visibility, along with safety considerations such as a throttle limiter. This comprehensive English-language manual provides complete factory service and repair information, intended for both do-it-yourself owners and experienced mechanics. It delves into detailed step-by-step instructions, supported by hundreds of photos and illustrations, covering all major systems including engine overhaul, transmission, electrical systems, chassis, suspension, and braking systems. The manual also details routine maintenance procedures, repair processes, troubleshooting, and diagnostics, enabling users to effectively maintain and repair their Mongoose/KXR 90/50 ATVs, ensuring optimal performance and longevity. 🏷️ Basic Information Identification Make: Kymco Model: Mongoose/KXR 90/50 Product Type: Workshop Service Repair Manual 👋 Introduction Market Position Value Proposition: Inexpensive way to keep vehicle working properly through self-service Competitive Analysis Manual Advantage: Highly detailed factory service manual with comprehensive illustrations and instructions Key Features Completeness Of Manual: 100% complete and intact 📋 Manual Details Coverage Areas Manual Coverage Scope: Complete factory service and repair Page Count Estimated Page Count: Hundreds of pages (exact count not specified but implied to be comprehensive) Manual Type Manual Format Type: Service Repair Manual Language Language: English Format Delivery Format: PDF Download 📖 Manual Coverage Systems Covered Engine Systems: Engine overhaul, carburetor, ignition, cooling, lubrication Transmission Drivetrain: Transmission inspection, repair, drive belt service Electrical Systems: Wiring diagrams, lighting, starting system, charging system Chassis Suspension: Front and rear suspension, steering system, wheel hub assembly Braking Systems: Brake system inspection, hydraulic components, pad replacement Body Frame: Body panel removal and installation, frame inspection Procedures Included Maintenance Procedures: Routine maintenance, oil changes, filter replacements, spark plug service Repair Procedures: Component disassembly, reassembly, part replacement Troubleshooting Diagnostics: Fault finding, diagnostic charts, common issue resolution Engine Rebuild: Complete engine disassembly and reassembly with detailed instructions Technical Depth Depth Of Information: Detailed step-by-step instructions for complete disassembly and repair Instructional Method: Includes hundreds of photos and illustrations for clarity Target Audience Intended Users: Do-it-yourself owners and experienced mechanics 📊 Manual Specifications File Format File Type: PDF Print Quality Printability: All pages printable Binding Type Binding Method: N/A (Digital PDF format) Paper Type Paper Quality: N/A (Digital PDF format) Compatibility Operating Systems: Compatible with all PC-based Windows operating systems and Mac ⚙️ Engine Specifications Primary Engine Engine Type 90: Likely 2-stroke, air-cooled, single-cylinder (typical for this class of ATV) Engine Type 50: Likely 2-stroke, air-cooled, single-cylinder (typical for this class of ATV) Performance Horsepower Estimate 90: Estimated 5-7 HP (typical for a 90cc engine of this era) Horsepower Estimate 50: Estimated 3-5 HP (typical for a 50cc engine of this era) Fuel System Fuel Delivery System: Carbureted (standard for this engine size and type) Ignition Ignition Type: CDI (Capacitor Discharge Ignition) Cooling Cooling System: Air-cooled 🔧 Transmission Standard Transmission Type: Automatic (CVT - Continuously Variable Transmission) Features Drive System: Chain Drive Transmission Fluid Spec: Specific CVT fluid type (refer to manual for exact specification and capacity) 📐 Dimensions Exterior Vehicle Type: All-Terrain Vehicle (ATV) Weights Dry Weight Estimate 90: Approx. 150-180 lbs (specific to model and year) Dry Weight Estimate 50: Approx. 130-160 lbs (specific to model and year) 🛡️ Safety Features Ratings Safety Compliance: Designed to meet relevant safety standards for youth ATVs (specific certifications not detailed in product description) Active Features Throttle Limiter: Often equipped with a throttle limiter screw for younger riders Passive Features Frame Construction: Steel tube frame for rigidity and durability Lighting: Headlights and taillight for visibility 💡 Technology Features Infotainment Infotainment Features: Basic instrumentation (speedometer, odometer, indicator lights). Driver Assistance Atv Specific Tech: Throttle limiting for safety, potentially speed governor. Connectivity Connectivity Options: N/A (ATV of this class typically lacks modern connectivity features). 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 50-100 operating hours or annually, refer to manual for precise interval. Air Filter Cleaning: Regular inspection and cleaning/replacement, especially in dusty conditions. Spark Plug Replacement: Interval varies, typically every 100-200 operating hours or based on inspection. Fluid Specifications Engine Oil Type: Specific SAE viscosity grade (e.g., SAE 10W-40 or 20W-50) and API classification (refer to manual). Gear Oil Type: Specific gear oil viscosity and API classification for the final drive. Known Issues Common Wear Items: Drive belts, brake pads, suspension bushings, carburetor cleaning due to fuel variability. Preventative Maintenance Chain Lubrication: Regular cleaning and lubrication of the drive chain is crucial for longevity. 📚 Vehicle History Brand Heritage Manufacturer Origin: Kymco (Kwang Yang Motor Co., Ltd.) is a Taiwanese manufacturer of scooters, motorcycles,...