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