Segment:
Entry-level youth ATV / Quad bike.
Target Audience:
Young riders, recreational off-road enthusiasts.
Competitors:
Similar models from brands like Suzuki (LT50, LT80), Yamaha (Grizzly 50/80), Polaris (Predator 50/90).
Vehicle Focus:
Ease of use, maneuverability, and suitability for younger riders.
Manual Value:
Provides in-depth technical guidance essential for maintaining and repairing this specific model, saving time and money on professional service.
Engine System:
Detailed diagnostics, overhaul, assembly, and troubleshooting of the 49cc 2-stroke engine.
Fuel System:
Carburetor adjustment, cleaning, fuel pump, fuel lines, and fuel tank maintenance.
Ignition System:
Ignition coil, CDI unit, spark plug, wiring, and troubleshooting.
Exhaust System:
Muffler, exhaust pipe inspection and replacement.
Cooling System:
Air cooling system component identification and maintenance.
Transmission System:
Automatic CVT (Continuously Variable Transmission) disassembly, inspection, belt replacement, and clutch operation.
Chassis Frame:
Frame inspection, repair considerations, and component mounting.
Suspension System:
Front fork (telescopic) disassembly, service, and rear shock absorber maintenance.
Braking System:
Front and rear brake system (drum or disc, depending on specific model variant), brake fluid replacement, pad/shoe inspection, and hydraulic system troubleshooting.
Steering System:
Handlebar, steering stem, bearings, and linkage inspection and adjustment.
Electrical System:
Wiring diagrams, lighting (headlight, taillight, turn signals), battery maintenance, starter motor, fuses, and electrical component testing.
Body And Trim:
Body panel removal, installation, and basic repair guidance.
Routine Maintenance:
Oil changes, spark plug replacement, air filter cleaning/replacement, chain adjustment (if applicable), and general inspection checklists.
Troubleshooting Guide:
Systematic diagnostic procedures for common performance issues, starting problems, and electrical faults.
Engine Overhaul:
Complete engine disassembly, cleaning, inspection of internal components (piston, cylinder, crankshaft, bearings), and reassembly with torque specifications.
Carburetor Rebuild:
Detailed steps for disassembling, cleaning, and reassembling the carburetor for optimal fuel mixture.
Transmission Service:
CVT belt replacement, clutch inspection, and roller weight diagnostics.
Brake Service:
Brake caliper service, drum brake shoe replacement, and bleeding the brake system.
Electrical Diagnostics:
Testing ignition system components, starter circuits, and lighting systems using multimeter readings.
Depth:
Intermediate to Expert level, covering routine maintenance, component replacement, diagnostics, and major overhauls.
Engine Type:
2-stroke, single-cylinder
Displacement:
49.5 cc (approx. 50cc)
Bore X Stroke:
39.0 mm x 41.4 mm (typical for this class)
Cooling System:
Forced air-cooled
Starting System:
Electric start with kick-start backup
Horsepower:
Approximately 4.0 - 5.0 HP (specifications may vary by region and specific tuning)
Torque:
Low-end torque for off-road capability
Fuel Type:
Unleaded gasoline
Fuel Oil Mixture:
2-stroke oil mixed with gasoline at recommended ratio (e.g., 50:1, consult manual for exact specification).
Carburetor Model:
Typically a Mikuni VM series or similar.
Overall Length:
Approximately 1450 mm (57.1 inches)
Overall Width:
Approximately 950 mm (37.4 inches)
Overall Height:
Approximately 900 mm (35.4 inches)
Wheelbase:
Approximately 980 mm (38.6 inches)
Dry Weight:
Approximately 110 kg (242.5 lbs)
Curb Weight:
Approximately 115 kg (253.5 lbs) with fluids
Weight Capacity:
Not typically specified for rider and cargo; designed for single rider use.
Atv Safety Standards:
Adheres to industry safety standards for youth ATVs (e.g., ANSI/SVIA 1-2010).
Throttle Limiter:
Often includes a throttle limiter screw for adjusting top speed suitable for beginner riders.
Parking Brake:
Hand-operated parking brake system.
Rollover Protection:
Not equipped with ROPS (Roll-Over Protection Structure); operator safety and proper riding techniques are paramount.
Lighting:
Headlights, taillight/brake light, often with front and rear reflectors.
Engine Oil Change:
Every 50-100 hours of operation or annually, using a specific 2-stroke pre-mix or separate oil injection system (consult manual).
Air Filter Cleaning:
Every 20-30 hours or as needed based on operating conditions (dusty environments require more frequent cleaning).
Spark Plug Replacement:
Every 100-150 hours or annually, checking gap regularly.
Cvt Belt Inspection:
Every 50-100 hours for wear and damage; replacement recommended at 100-150 hours or if any signs of fraying or cracking are present.
Engine Oil:
API TC-W3 certified 2-stroke engine oil (for pre-mix) or specific Kymco 2-stroke injection oil.
Gear Oil:
SAE 80 or 90 API GL-4 gear oil (typically small capacity, consult manual for exact type and amount).
Brake Fluid:
DOT 3 or DOT 4 brake fluid (check reservoir cap or manual for specific requirement).
Common Problems:
Carburetor gumming due to stale fuel, CDI unit failure, CVT belt wear, throttle cable sticking, and occasional electrical connection issues.
Preventative Measures:
Regular fuel stabilizer use, proper storage (fuel drained or stabilized), consistent air filter maintenance, and checking electrical connections.
Manufacturer:
Kymco (Kwang Yang Motor Co., Ltd.), a Taiwanese manufacturer known for its scooters, motorcycles, and ATVs.
Development:
The KXR50 line represents Kymco's offering in the youth ATV market, often evolving with minor cosmetic and mechanical updates over its production run.
Production Years Range:
The Mongoose KXR50 was produced across several years, with the 2003 model being part of its early to mid-production cycle.
