2004 Daelim S2-250 Service Manual (P/N SM50-0409-01E)

• Factory Daelim service manual for the S2-250, issued in September 2004 as a 201-page English-language PDF; the back cover carries document code SM50-0409-01E.
• Engine coverage reaches from removal and installation through camshaft and rocker-arm service, cylinder-head and valve work, cylinder/piston and ring inspection, crankcase separation, crankshaft checks, and final-reduction teardown and assembly.
• CVT repair sections detail the drive and driven pulleys, belt and weight-roller inspection, clutch disassembly and reassembly, clutch-shoe checks, driven-face bearing replacement, seals, wear limits, and reassembly specifications.
• Fuel-system work is specific to the CVK056A carburetor and covers removal, vacuum piston and diaphragm inspection, jets and float valve, auto bystarter testing, air cut-off valve, accelerator pump, float level, and mechanical fuel-pump output testing.
• Cooling procedures include radiator-cap pressure testing, radiator and fan removal, thermostatic-switch diagnosis, thermosensor and thermostat testing, water-pump mechanical-seal and bearing service, refill, leak checks, and air bleeding.
• Chassis repair covers front and rear wheel service, wheel bearings and speedometer drive, hydraulic master cylinders and calipers, brake bleeding, fork disassembly and seal replacement, steering-stem races, rear fork, and shock adjustment.
• Electrical diagnosis spans the MF battery, charging leakage/output, A.C. generator and regulator/rectifier, ignition coil and pulser, starter motor and magnetic switch, lighting controllers, switches and gauges, fuse/relay locations, harness routing, and the full wiring diagram.

Model and Workshop Scope

This publication is specific to the Daelim S2-250 and its underbone chassis. The engine and fuel chapters cover the carbureted 249 cc, liquid-cooled four-stroke SOHC single; this is not an EFI service manual. Because the repair procedures assume access to pullers, drivers, a clutch-spring compressor, a valve-spring compressor, pressure-test equipment, and electrical test instruments, it is best suited to professional technicians and experienced owners with a properly equipped workshop.

Engine, Drivetrain, and Fuel-System Depth

The top-end material covers valve-clearance inspection, cam timing and cam-chain tensioner installation, rocker-arm and camshaft inspection, cylinder-head disassembly, valve and spring checks, and head reassembly. Cylinder and piston sections add bore, ring, pin, and connecting-rod inspection limits. The lower-end chapters cover oil-pump rotor clearances, crankshaft runout and bearing play, crankcase separation, final-drive gears and shafts, and transmission-case bearing and oil-seal replacement.

Fuel troubleshooting addresses no-start, unstable idle, lean or rich mixture, backfire, high-speed misfire, and poor output/high fuel consumption. The related procedures let a shop inspect the carburetor circuits and diaphragms, verify the auto bystarter and heater operation, set the float, and test the vacuum-operated fuel pump without treating this scooter as an injected model.

Chassis, Cooling, and Electrical Diagnosis

The brake material includes master-cylinder and caliper teardown, piston/seal inspection, pad and disc checks, and bleeding with or without a brake bleeder. Suspension and steering coverage extends to fork oil-seal replacement, fork-tube and spring inspection, steering-head race replacement, wheel runout, and bearing service. Cooling diagnosis separates overheating, overcooling or unstable temperature, and leakage causes before moving into radiator, cap, switch, sensor, thermostat, water-pump, and mechanical-seal tests.

Charging and starting flowcharts step through current leakage, charging voltage, regulator/rectifier connections, generator-coil resistance, fuse status, brake/stop-switch input, side-stand interlock, relay operation, and starter-motor faults. The manual also distinguishes export and domestic harness couplers for headlight-switch and hazard-switch configurations.

Diagrams, Specifications, and Repair Cautions

Useful illustrations include the lubrication-system oil-flow section view, CVT exploded assembly, A.C. generator/starter-clutch exploded view, charging-system schematic, starter troubleshooting flowchart, and the full vehicle wiring diagram. The shop data covers the maintenance schedule, general and component-specific torque specifications, fluid capacities, wear limits, fits and clearances, electrical test values, coolant gravity, and fuse assignments.

Several repair traps are called out plainly. Oil or grease on the CVT belt and pulley faces reduces drive, while the water-pump impeller uses a left-hand thread. The top-end chapter also ties its specified cylinder-head fastener sequence directly to crack prevention.

Fuel, brake, cooling-system, and engine-removal work should be performed with the scooter securely supported and the relevant system made safe. The manual specifically warns about gasoline vapor, hot pressurized coolant, brake-fluid contamination of friction surfaces, and stored spring force in the CVT and front fork.