Yamaha RD250 (1978)

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The Yamaha RD250 is a two-stroke parallel twin motorcycle from the year 1978 with a torque induction engine. It has a capacity of 247 cc and a cooling system that is air cooled. The compression ratio is 6.7:1 and lubrication is autolube with induction from two Mikuni VM28 SC carburetors. The ignition system has a battery and coil with breaker points and it starts with a kick. The maximum power output is 30 hp at 7500 rpm with maximum torque of 21 lb-ft at 7000 rpm. The clutch is a wet multi-plate type and the transmission is 6-speed with a final drive through a chain. The gear ratio is 1st – 19.67, 2nd – 13.6, 3rd – 10.08, 4th – 7.59, 5th – 6.79 and 6th – 6.01. The front suspension is telescopic forks and the rear suspension is dual shocks. The front and rear brakes are single 267mm discs. The front tire size is 3.00S-18-4PR and rear tire size is 3.50S-18-4PR. The motorcycle’s length is 1995 mm, width is 830 mm, height is 1085 mm, wheelbase is 1325 mm, ground clearance is 150 mm, dry weight is 152 kg and fuel capacity is 16.5 liters.

Technical specifications:

Make Model: Yamaha RD 250

Year: 1978


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 267mm disc
Rear Brakes: Single 267mm disc
Front Tyre: 3.00S-18-4PR
Rear Tyre: 3.50S-18-4PR
Dimensions: Length 1995 mm / 78.5 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

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