1972–1982 Suzuki RV125 VanVan Service Manual (P/N 78-07, SR-2730)

• Covers the Suzuki RV125 configuration shown in this factory manual: a single-cylinder air-cooled two-stroke engine, Suzuki CCI lubrication, VM22SH carburetor, wet multi-disc clutch, five-speed constant-mesh transmission, flywheel magneto, and front and rear drum brakes.
• Documents engine removal, complete crankcase separation and reassembly, top-end service, crankshaft removal, clutch and kick-starter work, and transmission repair, with the factory inspection data needed to evaluate reusable parts.
• Explains the Suzuki CCI oiling system, including pump construction and drive, pump-to-throttle adjustment, oil-line bleeding, and lubrication-system preparation after engine assembly.
• Provides fault-isolation tables for hard starting, abnormal engine noise, overheating, clutch trouble, gear-shifting faults, and poor stability or steering, plus ignition, charging, rectifier, switch, and battery tests.
• Covers front-fork disassembly and assembly, rear shock construction, brake adjustment and inspection, split-rim wheel service, rear-wheel removal and installation, tire checks, and drive-chain maintenance.
• Uses factory drawings such as the transmission power-flow views, CCI lubrication diagram and oil-pump performance chart, ignition and charging schematics, front-fork section view, full wiring diagram, and foldout exploded engine view.
• Supplied as a 70-page PDF, including a 24-item special-tool list, inspection and repair specifications, component-specific tightening data, an important-functional-parts safety checklist, and the periodical inspection schedule.

Prepared by Suzuki Motor Co., Ltd., Export Service Section, this manual is for the two-stroke RV125 configuration described above. Suzuki states that the material was arranged so less-experienced mechanics could follow the assembly and disassembly work, while qualified mechanics would have the necessary inspection and repair data. It is best suited to readers who understand normal hand-tool use and motorcycle shop safety; it is not a basic owner's handbook.

Engine and Transmission Repair

The engine chapter follows removal from the frame, then identifies the work required to strip the cylinder head, cylinder, piston, flywheel magneto, oil pump, clutch, kick starter, shift mechanism, transmission shafts, and crankshaft. The crankcase is separated and joined with dedicated Suzuki tools. Assembly coverage records screw locations, seal replacement, shift-fork identification, clutch alignment, kick-starter orientation, and transmission washer and circlip placement.

Transmission coverage includes neutral plus first-through-fifth-gear power-flow diagrams. A separate assembly drawing shows the gears, washers, circlips, bearings, and tooth counts on both shafts. The manual also addresses the press-fit second drive gear and the checks required after countershaft work.

Fuel, Lubrication, and Troubleshooting

The VM22SH carburetor section contains an exploded view, factory jet and needle specifications, float-level setup, mixture guidance for altitude or climate changes, and idle adjustment. The CCI chapter traces the pump drive and oil paths, relates delivery to throttle position, and describes pump-cable adjustment and bleeding of both inlet and outlet lines.

Troubleshooting is organized by symptom. The charts lead through fuel flow, spark, compression, lubrication, carbon buildup, clutch condition, shift components, wheel alignment, steering-head parts, suspension, and frame condition so repair work can be limited to the system at fault.

Electrical and Chassis Coverage

Electrical sections show the flywheel-magneto ignition and charging circuits, then cover breaker-point and ignition-timing checks, primary and ignition-coil tests, condenser inspection, charging- and lamp-coil output checks, and rectifier testing. Internal switch-contact diagrams support ignition-switch, dimmer, turn-signal, and horn diagnosis. Battery initial-charge, state-of-charge, and recharge procedures are included.

Chassis work is supported by a labeled telescopic-fork section, fork teardown and reassembly procedures, a rear-shock spring characteristic chart, brake and drum inspection data, and exploded front- and rear-wheel views. The split-rim wheel instructions, chain servicing information, torque references, wear limits, capacities, clearances, and electrical test specifications make this useful for repair as well as routine maintenance.

Factory Tools and Model-Specific Cautions

The special-tool table identifies each tool by function and Suzuki part number. Examples include the crankcase separator 09910-92810, crankcase assembly tool 09910-32811, flywheel rotor remover 09930-30113, and timing gauge 09931-00112.

Two assembly cautions are especially important. After an engine rebuild, the CCI passages must be supplied with oil before startup; running them dry can produce bearing noise or piston seizure. The two-piece wheel rim must not be pried apart with a tire lever or opened while the tire is inflated, since incorrect handling can damage the rim and release the rim hardware under pressure.

Coverage is configuration-based: the publication does not contain year-by-year changes or serial-number break sections. Match the engine, carburetor, transmission, ignition, and brake configuration above to the motorcycle before ordering. Engine, wheel, brake, and electrical repair should be performed with the machine securely supported, the battery isolated where required, and the specified service tools used for the applicable operations.