Target Audience:
DIY enthusiasts, ATV owners, independent repair shops seeking factory-level repair information.
Manual Type Comparison:
Factory Service Repair Manual, providing OEM-level detail beyond generic repair guides.
Authenticity:
Genuine Kymco product, ensuring accuracy and completeness of repair procedures.
Content Depth:
Covers all systems, maintenance, and repairs for the Mongoose KXR 50 and 90 models.
Engine System:
Complete engine overhaul, component diagnostics, top-end and bottom-end procedures, carburetor/fuel injection tuning, cooling system maintenance, exhaust system service.
Transmission System:
Automatic CVT (Continuously Variable Transmission) disassembly, inspection, belt replacement, clutch and variator servicing, gearbox maintenance and repair.
Chassis And Frame:
Frame inspection, front and rear suspension geometry, shock absorber servicing, steering system components and adjustments, swingarm maintenance.
Braking System:
Front and rear brake caliper service, brake pad replacement, brake fluid bleeding and replacement, hydraulic system troubleshooting, drum brake (if applicable) adjustment and service.
Electrical System:
Ignition system diagnostics, starter motor and solenoid testing, lighting circuits (headlight, taillight, turn signals), battery maintenance and testing, charging system (stator, regulator/rectifier) checks, wiring harness inspection and repair, fuses and relays.
Bodywork And Trim:
Body panel removal and installation, seat servicing, fender and guard maintenance, handle bar components, decal and graphic application (if applicable).
Preventative Maintenance:
Recommended service intervals for oil changes, filter replacements, spark plug checks, chain lubrication (if applicable), brake adjustments, tire pressure checks.
Troubleshooting:
System-by-system diagnostic charts for common running issues, electrical faults, starting problems, and performance degradation.
Repair Procedures:
Detailed step-by-step instructions for disassembly, component replacement, and reassembly of all major vehicle systems.
Technical Specifications:
Torque specifications for critical fasteners, engine timing adjustments, carburetor jetting information, valve clearances (if applicable).
Diagnostic Capabilities:
Advanced diagnostic procedures, including identification of faulty components and troubleshooting common electrical and mechanical failures.
Rebuild Procedures:
Comprehensive guidance for complete engine and transmission rebuilds, including component measurement and tolerance checks.
Wiring Diagrams:
High-quality, detailed wiring diagrams for all electrical systems, facilitating accurate troubleshooting and repair.
Illustrations:
Hundreds of photos and diagrams illustrating disassembly, assembly, and component identification.
Engine Type 50Cc:
Air-cooled, 2-stroke, single-cylinder (specific model dependent, typically a variation of the Kymco CK1 engine architecture).
Engine Type 90Cc:
Air-cooled, 2-stroke, single-cylinder (specific model dependent, typically a bored-out version of the 50cc engine or a dedicated 90cc unit).
Bore Stroke 50Cc:
Typically around 39mm x 41.4mm (subject to specific engine variant).
Bore Stroke 90Cc:
Typically around 46mm x 49.6mm (subject to specific engine variant).
Carburetor Spec 50Cc:
Mikuni VM20 or similar (specific model dependent, manual will detail exact type and jetting).
Carburetor Spec 90Cc:
Larger carburetor, typically Mikuni VM24 or similar (specific model dependent, manual will detail exact type and jetting).
Fuel Type:
Unleaded gasoline with 2-stroke oil mix (pre-mix or oil injection system dependent, manual will specify).
Length:
Refer to specific model year specifications within the manual (typically around 1500-1600 mm).
Width:
Refer to specific model year specifications within the manual (typically around 900-1000 mm).
Height:
Refer to specific model year specifications within the manual (typically around 950-1050 mm).
Dry Weight 50Cc:
Typically around 90-100 kg (manual will have precise figures).
Dry Weight 90Cc:
Typically around 95-105 kg (manual will have precise figures).
Safety Features Overview:
Designed for off-road recreational use, safety features focus on reliable braking, stable handling, and operator control. Specific safety ratings are typically not applicable in the same way as road vehicles.
Active Safety Brakes:
Disc brakes (front and rear) or disc front/drum rear, providing effective stopping power. Manual details proper brake maintenance for optimal performance.
Active Safety Suspension:
Independent front suspension and rear swingarm with shock absorber for stable handling over varied terrain.
Passive Safety Frame:
Robust steel frame designed for durability and rider support.
Infotainment Features:
Basic instrumentation (speedometer, odometer, neutral/gear indicator lights), no advanced infotainment features typical of automotive applications.
Driver Assistance Systems:
None.
Connectivity Features:
None.
Headlight Type:
Halogen bulbs (typically single or dual bulb setup, manual will detail).
Taillight Type:
Incandescent or LED (model dependent, manual will confirm).
Engine Oil Change Interval:
Typically every 1000 km or 6 months, whichever comes first (refer to manual for exact mileage and time).
Air Filter Cleaning:
Recommended every 500 km, or more frequently in dusty conditions.
Spark Plug Check:
Recommended every 1000 km.
Brake Fluid Change:
Recommended every 2 years or as per manual inspection.
Engine Oil Type:
API SG or higher, SAE 10W-40 or 20W-50 motorcycle-specific 4-stroke engine oil (manual will specify precise grade and API rating).
Transmission Oil Type:
Refer to manual for specific gearbox oil type if separate from engine oil.
Brake Fluid Type:
DOT 3 or DOT 4 hydraulic brake fluid (manual will specify exact type).
Coolant Type:
N/A (typically air-cooled engines)
Common Wear Items:
CVT belt wear, brake pad and shoe wear, spark plug fouling (especially in 2-stroke engines), carburetor jet clogging.
Electrical Corrosion:
Potential for corrosion in connectors due to off-road use and environmental exposure; manual guides inspection and cleaning.
Kymco History:
Kymco (Kwang Yang Motor Co., Ltd.) is a Taiwanese company founded in 1964. It is a major manufacturer of scooters, motorcycles, and ATVs, known for producing reliable and affordable vehicles, often for global brands.
Mongoose Kx Lineage:
The Mongoose KXR series represents Kymco's entry into the youth/entry-level ATV market, evolving from earlier Kymco ATV designs. The 50cc and 90cc variants cater to different age and skill levels, offering a scaled experience.
Production Location:
Primarily manufactured in Taiwan by Kymco.
