The Yamaha RD125 motorcycle was manufactured in 1979 and 1980. The bike is powered by a two-stroke, parallel twin engine, with a capacity of 124cc. The air-cooled engine has a bore x stroke of 43×43 mm and a compression ratio of 6.8:1. The induction system includes two 18mm Teikei carburetors and uses battery coil ignition. The bike is started with a kick. The maximum power output produced is 17 hp / 12.4 kW at 8500 rpm, and the maximum torque is 1.3 kgf-m at 8000 rpm. The five-speed transmission drives the bike using a chain final drive with a gear ratio of (1) 34.52 (2) 19.67 (3) 14.11 (4) 11.34 (5) 9.11. The steel tube frame has an engine used as a stressed member, while a 28 mm telescopic fork and dual rear shocks adjustable for preload provide suspension. The bike has a single 240mm disc brake on the front and a 130mm drum brake on the rear. The front and rear tires are 2.75-18 and 3.00-18, respectively. The wheelbase is 1245 mm / 49.0 in, with a seat height of 749 mm / 29.5 in. The bike weighs 115 kg / 255 lbs, and its fuel capacity is 11.5 Litres / 3.04 US gal.
Technical specifications:
Make Model: Yamaha RD 125
| Year | 1979 – 80 |
|---|---|
| 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 |
