The Yamaha RD125 was a motorcycle produced between 1974 and 1975. It had a 124cc two-stroke parallel twin engine and was air-cooled with a compression ratio of 6.8:1. The bike had a maximum power of 17 horsepower at 8500 rpm and a maximum torque of 1.3 kgf-m at 8000 rpm. It had a 5-speed transmission and a chain final drive. The frame was made of steel tubing with the engine used as a stressed member. The front suspension consisted of 28mm telescopic forks and the rear suspension was dual rear shock pre-load adjustable. The bike had front and rear drum brakes, with a front tyre size of 2.75-18 and a rear tyre size of 3.00-18. The wheelbase was 1245mm and the seat height was 749mm, with a wet weight of 115 kg and a fuel capacity of 11.5 litres. The standing 1/4 mile time for the bike was 18.2 seconds and its top speed was 81 mph.
Technical specifications:
Make Model: Yamaha RD 125
| Year | 1974 – 75 |
|---|---|
| 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 | 150 mm Drum |
| 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 |
| Standing 1/4 Mile | 18.2 sec |
| Top Speed | 81 mph |
