2002–2007 Hyosung RT 125 Karion Service & Repair Manual (Manual No. 99000-94610)

This factory service manual covers the 2002–2007 Hyosung RT 125 Karion. It is Hyosung Manual No. 99000-94610, first edition November 2002.

PDF Search, Wiring Detail and Page Breakdown

Text search and wiring detail: Most chapter text is searchable, but some diagram labels and special characters are not recognized correctly. There are no embedded PDF bookmarks. Small wiring labels require zooming.

The download is one printable, 162-page PDF in English: 150 numbered technical pages, seven section contents pages, three introductory pages, one cover, and one publication page. All 12 unnumbered pages are already included in the total.

Engine Repair, Carburetor Service and Fault Tracing

Beyond the selected coverage below, the manual includes combination-meter continuity checks and battery electrolyte-filling instructions.

• Engine repair: Step-by-step engine removal and reinstallation, upper- and lower-end overhaul, crankcase separation, valve timing, and oil-pump removal and installation.

• Clutch and transmission: Wet multi-plate clutch inspection, release adjustment, geartrain reassembly, shift-fork installation, and kick-starter and starter-clutch service.

• Fuel system: PD 18 F carburetor disassembly, jet cleaning, float and needle-valve inspection, accelerator-pump service, pilot-screw adjustment, and fuel-cock servicing.

• Electrical diagnosis: DC-CDI ignition, magneto and regulator/rectifier tests, starter-motor inspection, switch checks, and system circuit diagrams.

• Chassis and brakes: Front-fork overhaul, steering-stem and swingarm service, wheel-bearing replacement, front disc-brake repair, and rear drum-brake servicing.

• Service references: Troubleshooting charts, wiring diagrams, wire and cable routing views, tightening torque tables, and component inspection limits.

It is intended for readers who already have the knowledge and practical skills to service Hyosung vehicles.

Engine Repair and Maintenance

Compression and oil-pressure testing accompany inspection of the four-stroke SOHC engine. The overhaul sections cover the cylinder, piston, rings, camshaft, rocker arms, and valves, with related wear limits and adjustment data.

Timing and transmission: The valve timing diagram and transmission cross-sectional view clarify camshaft timing and the positions of gears, washers, and circlips. Separate instructions distinguish the closely similar shift forks and cover the kick-starter mechanism and starter clutch.

The crankcase-separation section warns that leaving the transmission in the wrong case half can damage the gearshift cam stopper.

Routine service: Periodic maintenance charts cover engine oil and filter changes, valve-clearance checks, and drive-chain care. Lubrication-point and exterior illustrations supplement the scheduled inspections.

PD 18 F Carburetor and Fuel System

Repair coverage extends to the accelerator-pump diaphragm, float and needle valve, throttle valve, jet needle, and fuel cock. Float-height, pilot-screw, choke-cable, and throttle-cable adjustments are documented.

The troubleshooting chart separates starting, low-speed, high-speed, and overflow complaints, helping narrow the relevant carburetor circuit before disassembly. Carburetor cautions identify pilot-screw seat damage caused by forcing the screw.

Observe the manual's ventilation and ignition-source precautions when working on fuel and electrical systems.

Electrical Diagnosis and Circuit Diagrams

The electrical section pairs magneto pickup-coil and charging-coil measurements with CDI resistance tables and regulator/rectifier terminal tests. It also covers generator no-load output, battery charging checks, starter brushes and armature testing, and switch continuity.

The CDI section notes that normal meter readings do not rule out every fault.

Separate Charging System and Starter System circuit diagrams support the main wiring diagram. Connector views, wire-color keys, and cable-routing drawings show how the electrical components connect.

Brakes, Suspension, and Workshop Data

Front-brake repair includes caliper and master-cylinder disassembly, inspection, reassembly, and bleeding. Rear-brake coverage addresses the drum, shoes, cam, and pedal adjustment.

Front-fork procedures include seal replacement and oil-level setting, alongside steering-bearing and swingarm inspection.

Rear shock scope: Removal, inspection, and replacement are covered; the manual identifies the shock as unserviceable and warns against disassembly.

Workshop references: Service data includes transmission gear ratios, final reduction, fluid capacities, tire pressures, brake-fluid requirements, and front-fork oil levels. Component torque tables cover cylinder-head nuts, engine mounting bolts, oil drain plugs, and chassis fasteners.

The illustrated special-tool list identifies the crankcase separator 09920-13120, crankshaft installer 09910-32812, and clutch sleeve hub holder 09920-53710.

Examples of Valve-Clearance and Charging Specifications

The valve-clearance section specifies 0.08–0.13 mm for both intake and exhaust valves with the engine cold and the piston at compression TDC.

Charging-output specifications list 14.0–15.0 V at 5,000 rpm with a fully charged battery. The separate magneto no-load test specifies 67–99 V AC at 5,000 rpm.