1978 Honda CR125 Specifications and Specs
Specifications and workshop reference information for the 1978 Honda CR125, 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 | Air-cooled 2-stroke single-cylinder reed valve |
| Displacement | 123 cc |
| Bore × Stroke | 56.0 mm × 50.0 mm |
| Compression Ratio | 8.2:1 |
| Maximum Power | Approx. 25 hp |
| Maximum Torque | |
| Carburetor | Mikuni VM32 | Replacement Options |
| Lubrication | Pre-mix |
| Fuel Mix Ratio | 20:1 | Premix Calculator |
| Ignition | CDI magneto |
| Spark Plug | NGK B9ES |
| Spark Plug Gap | 0.6 - 0.7 mm |
Transmission
| Transmission Type | 6-speed close-ratio |
| Clutch | Wet multi-plate |
| Primary Reduction | 3.476 |
| Final Reduction | Chain drive |
Dimensions
| Overall Length | 84.1 in |
| Overall Width | 35.2 in |
| Overall Height | 45.9 in |
| Wheelbase | 56.1 in |
| Ground Clearance | 12.8 in |
| Fuel Tank Capacity | 1.9 gal |
| Bearing Sizes |
Bearing Finder |
Chassis
| Frame Type | Double cradle steel frame |
| Caster Angle | 28° |
| Trail | 4.7 in |
| Front Suspension | Leading-axle telescopic forks | Fork Oil Levels |
| Rear Suspension | Dual shock swingarm |
| Front Suspension Travel | 11.0 in |
| Rear Suspension Travel | 4.9 in |
Brakes & Wheels
| Front Tire | 2.75 × 21 | Tyre Size Guide |
| Rear Tire | 3.50 × 18 | Tyre Size Guide |
| Front Brake | Internal expanding shoe drum |
| Rear Brake | Internal expanding shoe drum |
125cc Other Specs
Community
VMX Owners Forum
Discuss vintage motocross bikes, restorations, tuning and riding.
