Category:
        
        
            Lightweight Dual-Sport / Street Motorcycle
        
     
    
        
            Target Audience:
        
        
            Commuters, entry-level riders, recreational riders seeking an affordable and versatile machine.
        
     
    
    
        
            Competitors:
        
        
            Honda XR/CRF series (125cc variants), Yamaha TW/XT series (125cc variants), Kawasaki KLX series (125cc variants), Suzuki DR-Z/TS series (125cc variants).
        
     
    
    
        
            Design Philosophy:
        
        
            Combines on-road usability with light off-road capability, offering a rugged yet accessible package.
        
     
    
        
            Engine Type:
        
        
            Air-cooled, four-stroke, single-cylinder engine known for reliability and fuel efficiency.
        
     
    
        
            Ergonomics:
        
        
            Upright riding position, dual-purpose tires, and relatively long-travel suspension contribute to comfort and versatility.
        
     
    
        
            Manual Value:
        
        
            Essential for owners and technicians to maintain the RT125 Karion's longevity and performance, covering all aspects of repair and upkeep.
        
     
 
    
    
    
        
            Engine:
        
        
            Detailed disassembly, assembly, inspection, and repair of the 125cc engine, including cylinder head, piston, crankshaft, camshaft, valve train, and lubrication system.
        
     
    
        
            Fuel System:
        
        
            Carburetor tuning, cleaning, and overhaul; fuel tank and lines inspection and maintenance.
        
     
    
        
            Ignition System:
        
        
            Spark plug specifications, ignition timing, CDI unit inspection, and troubleshooting.
        
     
    
        
            Transmission:
        
        
            Clutch operation, maintenance, and adjustment; gearbox disassembly, inspection, and reassembly.
        
     
    
        
            Cooling System:
        
        
            Air cooling system maintenance, including fin cleaning and inspection.
        
     
    
        
            Electrical System:
        
        
            Wiring diagrams, battery maintenance, starter motor, alternator/generator, lighting systems (headlight, taillight, indicators), horn, and switches.
        
     
    
        
            Brake System:
        
        
            Front and rear brake inspection, adjustment, and component replacement (pads, shoes, calipers/drums, levers, cables).
        
     
    
        
            Suspension System:
        
        
            Front fork (telescopic) disassembly, service, and seal replacement; rear shock absorber inspection and mounting.
        
     
    
        
            Steering System:
        
        
            Handlebar inspection, steering bearing adjustment, and front fork mounting.
        
     
    
        
            Wheel And Tires:
        
        
            Tire pressure specifications, wheel bearing inspection, and spoke tensioning (if applicable).
        
     
    
        
            Frame And Bodywork:
        
        
            Frame inspection, fuel tank removal/installation, seat, fenders, and fairings.
        
     
    
    
        
            Basic Maintenance:
        
        
            Oil changes, filter replacement, chain adjustment, spark plug replacement, air filter cleaning/replacement.
        
     
    
        
            Troubleshooting:
        
        
            Diagnostic flowcharts and common problem identification for starting issues, running problems, electrical faults, etc.
        
     
    
        
            Disassembly And Assembly:
        
        
            Step-by-step instructions for removing, inspecting, servicing, and reinstalling all major vehicle components.
        
     
    
        
            Engine Rebuild:
        
        
            Detailed procedures for engine overhaul, including piston ring replacement, gasket replacement, and bearing checks.
        
     
    
        
            Electrical Diagnostics:
        
        
            Component testing, continuity checks, and voltage measurements using multimeters.
        
     
    
        
            Brake Service:
        
        
            Brake pad/shoe replacement, caliper/wheel cylinder service, and bleeding procedures.
        
     
    
        
            Suspension Service:
        
        
            Front fork oil change and seal replacement, shock absorber mounting.
        
     
    
        
            Special Tools:
        
        
            Identification of necessary special tools for specific repair procedures.
        
     
    
    
        
            Depth:
        
        
            Comprehensive, covering all aspects from basic checks to complete engine and component rebuilds. Suitable for professional mechanics and experienced DIY enthusiasts.
        
     
 
    
    
    
        
            Engine Type:
        
        
            Four-stroke, SOHC, Air-cooled, Single Cylinder
        
     
    
        
            Displacement:
        
        
            124 cc (approximate, based on model designation)
        
     
    
        
            Bore X Stroke:
        
        
            Specifics to be found in manual (e.g., 54.0 mm x 54.5 mm typical for 125cc class)
        
     
    
        
            Compression Ratio:
        
        
            Specifics to be found in manual (e.g., 9.5:1 - 10.0:1 typical)
        
     
    
    
        
            Horsepower:
        
        
            Estimated 10-12 HP (actual figures vary by region and specific tuning)
        
     
    
        
            Torque:
        
        
            Estimated 7-9 lb-ft (actual figures vary)
        
     
    
    
        
            Carburetor Type:
        
        
            CV Carburetor (e.g., Mikuni VM series or similar) - Specific model to be confirmed in manual
        
     
    
        
            Fuel Type:
        
        
            Unleaded Gasoline
        
     
    
        
            Fuel Capacity:
        
        
            Typical 8-10 Liters (manual will provide exact capacity)
        
     
    
    
        
            Oil Type:
        
        
            API SG or higher, SAE 10W-40 Motorcycle Oil recommended (manual will specify exact grade and API classification)
        
     
    
        
            Oil Capacity:
        
        
            Approx. 1.0-1.2 Liters (manual will provide exact capacity including filter change)
        
     
 
    
    
    
        
            Engine Oil Change:
        
        
            Every 3,000 km or 6 months (whichever comes first, refer to manual for exact interval)
        
     
    
        
            Oil Filter Replacement:
        
        
            Concurrent with oil changes (if equipped with a replaceable filter element, otherwise screen cleaning)
        
     
    
        
            Air Filter Cleaning:
        
        
            Every 3,000 km or 6 months (more frequently in dusty conditions)
        
     
    
        
            Spark Plug Replacement:
        
        
            Every 6,000 km (refer to manual for specific plug type and gap)
        
     
    
        
            Valve Clearance Check:
        
        
            Every 6,000 km or 12 months (critical for performance and engine longevity)
        
     
    
        
            Chain Lubrication And Adjustment:
        
        
            Every 1,000 km or more frequently as needed.
        
     
    
    
        
            Engine Oil Specification:
        
        
            API SG or higher, SAE 10W-40 (refer to manual for definitive specification)
        
     
    
        
            Brake Fluid Type:
        
        
            DOT 3 or DOT 4 (refer to manual for exact specification)
        
     
    
        
            Fork Oil Type And Level:
        
        
            Specific viscosity (e.g., 10W) and level to be detailed in manual.
        
     
    
    
        
            Common Wear Items:
        
        
            Brake pads/shoes, clutch plates, chain and sprockets, tires, fork seals, and carburetor jets are common wear items that require regular inspection and replacement.
        
     
    
        
            Carburetor Issues:
        
        
            Can be prone to clogging if fuel is left standing for extended periods or if contaminated. Regular cleaning and proper fuel storage are recommended.
        
     
    
        
            Electrical Connections:
        
        
            Corrosion or looseness in electrical connectors can lead to intermittent issues. The manual provides guidance on inspection and cleaning.
        
     
 
    
    
    
        
            Manufacturer:
        
        
            Hyosung Motors & Machinery Inc. (South Korea)
        
     
    
        
            Brand Focus:
        
        
            Known for producing a range of motorcycles, scooters, and ATVs, often with competitive pricing and a focus on value.
        
     
    
    
        
            Rt125 Lineage:
        
        
            The RT125 Karion is part of Hyosung's effort to capture the entry-level and dual-sport market segments, building on their experience with smaller displacement engines.
        
     
    
    
        
            Production Period:
        
        
            Production commenced around 2001 and continued for several years, with variations and updates likely occurring over its lifecycle.
        
     
    
        
            Manufacturing Location:
        
        
            South Korea