Yamaha RD250 (1975)

The Yamaha RD250 motorcycle was first introduced in 1975 and had a two-stroke engine with a parallel twin configuration and a capacity of 247cc. The engine was cooled by air and had a compression ratio of 6.7:1 with an autolube lubrication system. The bike had two Mikuni VM28 SC carburetors for induction and used battery and coil with breaker points for ignition. It had a maximum power of 30 horsepower at 7500 rpm and a maximum torque of 21 lb-ft at 7000 rpm. The clutch was a wet multi-plate type and the bike had a six-speed transmission with a chain final drive. The gear ratios were 1st 19.67/2nd 13.6/3rd 10.08/4th 7.59/5th 6.79/6th 6.01.

The Yamaha RD250 had telescopic forks for its front suspension and dual shocks for the rear suspension. The front brakes were a single disc type and the rear brakes were drum brakes. The bike had a 3.00S-18-4PR front tire and a 3.50S-18-4PR rear tire. The bike’s dimensions were 2030mm in length, 830mm in width, and 1085mm in height, with a wheelbase of 1325mm and a ground clearance of 150mm. The dry weight of the bike was 152kg and it had a fuel capacity of 16.5 liters. Overall, the Yamaha RD250 was a popular motorcycle known for its power and reliability.

Technical specifications:

Make Model: Yamaha RD 250

Year: 1975
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