1983 Suzuki RM125
Specifications and workshop reference information for the 1983 Suzuki RM125, including engine, chassis, service data and setup details.
Note: Specs are compiled from factory data, manuals and owner feedback. Bikes vary — if yours is different, jump into the forum and share it.
General Specifications
| Engine Type | 123cc, liquid-cooled, 2-stroke single |
| Displacement | 123 cc |
| Bore × Stroke | 54.0 mm × 54.0 mm |
| Compression Ratio | ~7.8:1 |
| Maximum Power | ~30 hp |
| Maximum Torque | ~19 Nm |
| Carburetor | Mikuni VM34SS |
| Lubrication | Premix |
| Fuel Mix Ratio | 32:1 |
| Ignition | Suzuki PEI / CDI |
| Spark Plug | NGK B9ES / BR9ES |
| Spark Plug Gap | 0.6–0.7 mm |
Transmission
| Transmission Type | 6-speed manual |
| Clutch | Wet multi-plate |
| Primary Reduction | ~3.200 |
| Final Reduction | ~3.846 (50/13) |
| Overall Reduction | N/A |
Dimensions
| Overall Length | ~2130 mm |
| Overall Width | ~820 mm |
| Overall Height | ~1230 mm |
| Wheelbase | ~1425 mm |
| Ground Clearance | ~330 mm |
| Fuel Tank Capacity | ~8.5 L |
Chassis
| Frame Type | Steel single cradle |
| Caster Angle | ~27.5° |
| Trail | ~115 mm |
| Front Suspension | Telescopic forks |
| Rear Suspension | Full Floater monoshock |
| Front Suspension Travel | ~290 mm |
| Rear Suspension Travel | ~300 mm |
Brakes & Wheels
| Front Tire | 2.75-21 |
| Rear Tire | 4.10-18 |
| Front Brake | Drum |
| Rear Brake | Drum |
125cc Other Specs
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