The Yamaha RD125 was a motorcycle produced in 1978. It had a 124cc, air-cooled, two-stroke parallel twin engine with a compression ratio of 6.8:1. The bike used two 18mm Teikei carburetors, and the ignition was battery coil. The kick-started engine produced 17 horsepower at 8500 RPM and a maximum torque of 1.3 kgf-m at 8000 RPM. The transmission was five-speed and its gears had ratios ranging from 34.52 to 9.11. The bike’s frame was built with steel tubes, and the engine was used as a stressed member. It had 28mm telescopic forks for the front suspension and dual rear shock pre-load that could be adjusted. The front disc brake measured 240mm, whereas the rear drum measured 130mm. The bike rolled on 2.75-18 front and 3.00-18 rear tires with a wheelbase spanning 1245mm, and a seat height of 749mm. The bike weighed 115kg and had an 11.5-liter fuel tank.
Technical specifications:
Make Model: Yamaha RD 125
| Year | 1978 |
|---|---|
| Engine | Two stroke, parallel twin |
| Capacity | 124 cc / 7.6 cu-in |
| Bore x Stroke | 43 43 mm |
| Cooling System | Air cooled |
| Compression Ratio | 6.8:1 |
| Induction | 2x 18mm Teikei carburetors |
| Ignition | Battery coil |
| Starting | Kick |
| Max Power | 17 hp / 12.4 kW @ 8500 rpm |
| Max Torque | 1.3 kgf-m @ 8000 rpm |
| Transmission | 5 Speed |
| Final Drive | Chain |
| Gear Ratio | (1) 34.52 (2) 19.67 (3) 14.11 (4) 11.34 (5) 9.11 |
| Frame | steel tube engine used as a stressed member |
| Front Suspension | 28 mm telescopic forks |
| Rear Suspension | Dual rear shock pre-load adjustable |
| Front Brakes | Single240mm disc |
| Rear Brakes | 130 mm Drum |
| Front Tyre | 2.75-18 |
| Rear Tyre | 3.00-18 |
| Wheelbase | 1245 mm / 49.0 in |
| Seat Height | 749 mm / 29.5 in |
| Wet Weight | 115 kg / 255 lbs |
| Fuel Capacity | 11.5 Litres / 3.04 US gal |
