The Yamaha RD250 motorcycle was produced in 1973 and is a two-stroke, parallel twin engine with a capacity of 247 cc. It has a compression ratio of 6.7:1 and is air-cooled. The autolube lubrication system is used, and it has a 2x Mikuni VM28 SC carburetor induction. The ignition system consists of a battery and coil with breaker points, and it can be started with a kick. The maximum power output is 30 hp at 7500 rpm, and the maximum torque is 21 lb-ft at 7000 rpm. The motorcycle includes a wet multi-plate clutch and a six-speed transmission with a final drive chain. The gear ratios are 1st 19.67, 2nd 13.6, 3rd 10.08, 4th 7.59, 5th 6.79, and 6th 6.01. It also has a telescopic fork front suspension and dual shock rear suspension, and the front brake is a single disc while the rear brake is a drum. The motorcycle is equipped with 3.00S-18-4PR front tires and 3.50S-18-4PR rear tires. The dimensions of the motorcycle are 2030 mm in length, 830 mm in width, and 1085 mm in height with a wheelbase of 1325 mm and ground clearance of 150 mm. The motorcycle has a dry weight of 152 kg and has a fuel capacity of 16.5 liters.
Technical specifications:
Make Model: Yamaha RD 250
| Year | 1973 |
|---|---|
| Engine | Two stroke, torque induction, parallel twin |
| Capacity | 247 cc / 15.0 cu-in |
| Bore x Stroke | 54 54 mm |
| Cooling System | Air cooled |
| Compression Ratio | 6.7:1 |
| Lubrication | Autolube |
| Induction | 2x Mikuni VM28 SC carburetor |
| Ignition | Battery and coil with breaker points |
| Starting | Kick |
| Max Power | 30 hp / 22.3 kW @ 7500 rpm |
| Max Torque | 21 lb-ft / 2.9 kgf-m @ 7000 rpm |
| Clutch | Wet multi-plate |
| Transmission | 6 Speed |
| Final Drive | Chain |
| Gear Ratio | 1st 19.67 / 2nd 13.6 / 3rd 10.08 4th 7.59 / 5th 6.79 / 6th 6.01 |
| Front Suspension | Telescopic forks |
| Rear Suspension | Dual shocks |
| Front Brakes | Single disc |
| Rear Brakes | Drum |
| Front Tyre | 3.00S-18-4PR |
| Rear Tyre | 3.50S-18-4PR |
| Dimensions | Length 2030 mm / 79.9 in Width 830 mm / 32.6 in Height 1085 mm / 42.7 in |
| Wheelbase | 1325 mm / 52.1 in |
| Ground Clearance | 150 mm / 5.9 in |
| Dry Weight | 152 kg / 335 lbs |
| Fuel Capacity | 16.5 Liters / 4.2 US gal |
