2004–2007 Daelim Roadwin VJ 125 Scooter Factory Service Manual (P/N SM48-0401-01E)

• Factory document and model coverage: Covers the Daelim Roadwin VJ125 in a 251-page PDF, published in 2004 under OEM publication code SM48-0401-01E and organized into 21 repair and diagnostic sections.
• Engine and drivetrain repair: Documents engine removal and installation, clutch and gearshift service, AC generator and starter clutch work, cylinder-head/valve repair, piston and cylinder inspection, crankcase separation, transmission service, and crankshaft/bearing procedures.
• Maintenance, lubrication, and fuel systems: Includes the factory service schedule, adjustment checks, oil-pump/filter service, fuel-tank and air-cleaner removal, carburetor overhaul, float and accelerator-pump inspection, and pilot-screw adjustment.
• Chassis and hydraulic brake work: Covers front and rear wheels, bearings, speedometer drive, fork and steering-stem repair, rear cushion and swingarm work, brake-fluid replacement and bleeding, master cylinders, calipers, pads, and discs.
• Electrical testing and fault isolation: Provides charging-system, regulator/rectifier, CDI, pulse-generator, ignition-coil, side-stand switch, starter, lighting, meter, switch, and fuel-unit tests, supported by the complete wiring diagram and troubleshooting charts.
• Factory reference data: Supplies component-specific torque tables, service limits, inspection dimensions, clearances, lubrication and capacity data, electrical test specifications, exploded views, wiring and cable-routing drawings, and a special-tool index.

Engine, Fuel, and Drivetrain Repair Scope

The specifications identify the VJ125 as a 124.1 cm³ air-cooled four-stroke SOHC single with a chain-driven valve train, wet multiplate clutch, and constant-mesh five-speed transmission. The fuel chapter also identifies the PD24 carburetor by its VJ125 C setting-series mark, helping match the carburetor configuration to the correct factory procedures.

A useful scope note separates in-frame jobs from work requiring engine removal. The oil pump, carburetor, radiator, clutch, gearshift mechanism, AC generator, and starter clutch can be serviced with the engine installed. Cylinder-head and valve work, cylinder and piston repair, transmission repair, and crankshaft service require engine removal.

The engine itself is specified as air-cooled. The separate Cooling System chapter is limited to radiator removal, core and hose inspection, and the associated oil-through bolts rather than conventional coolant draining and refilling.

The cylinder-head chapter covers camshaft removal, rocker-arm and holder inspection, valve and guide service, valve-seat reconditioning, cam timing, cam-chain tensioner installation, and final adjustment. Separate sections add piston-ring and cylinder inspection, small-end bearing checks, crankcase separation, transmission-shaft and shift-fork inspection, crankshaft measurement, bearing replacement, transmission assembly, and crankcase reassembly. Clutch coverage includes the discs, plates, springs, outer, center, lifter mechanism, gearshift spindle, primary drive gear, and right crankcase cover.

Routine service is organized around the factory maintenance schedule. It covers fuel and throttle controls, choke and air-cleaner service, spark plug and valve checks, compression testing, idle adjustment, drive-chain service, brake and clutch checks, suspension, wheels and tires, fasteners, and steering-head bearings. The lubrication section addresses oil level and changes, filter replacement, oil-pump inspection, and chassis lubrication. Fuel-system procedures extend through carburetor removal, disassembly, passage and jet cleaning, float and float-valve inspection, accelerator-pump checks, reassembly, and pilot-screw setup.

Chassis, Brakes, and Electrical Diagnosis

Frame repair coverage includes handlebar controls, front-wheel inspection, bearing replacement, speedometer-gear service, fork disassembly and assembly, bushing and seal work, steering-stem removal, and bearing-race replacement. Rear-chassis procedures cover the wheel, bearings, driven flange, damper rubber, rear cushion, and swingarm. The external-parts chapter handles the seat, side covers, cowl and fenders, muffler/exhaust pipe, and rear mudguard.

The hydraulic brake chapter goes beyond pad replacement. It documents fluid replacement and air bleeding, hose and disc inspection, front and rear master-cylinder repair, caliper overhaul, piston and seal inspection, reassembly, and brake-pedal service.

Electrical sections combine circuit diagrams with measurement procedures. The specifications identify a DC-CDI ignition system, with separate checks for the CDI unit, pulse generator, ignition coil, timing, and side-stand interlock. Illustrated references include harness and cable-routing views, the main wiring diagram, charging-system circuit and fault chart, CDI ignition circuit, side-stand operating chart, starter circuit, and exploded transmission and brake views. Diagnostic flowcharts cover hard starting, loss of power, poor low- and high-speed operation, handling or suspension complaints, and fuel-gauge faults.

The tool index calls out the clutch center holder, ACG rotor puller, valve-guide and valve-seat tooling, bearing-removal and crankcase assembly tools, fork-seal and steering-stem tools, compression gauge, digital tester, PVA tester, and CDI tester. Related torque values, wear limits, clearances, and electrical specifications are placed with the applicable repair chapter.

The manual flags two repair traps that generic guides often miss: forcing the carburetor pilot screw can damage its seat, and turning a valve too quickly during cylinder-head assembly can damage the stem seal. Engine removal requires secure motorcycle and engine support, while electrical work calls for proper battery isolation before connectors or charging components are serviced.