Yamaha RD250 (1979)

The Yamaha RD 250 from 1979 is a two-stroke motorcycle with a 247cc parallel twin engine. It has a compression ratio of 6.7:1 and uses autolube lubrication. The bike’s 2x Mikuni VM28 SC carburetor helps with induction, while its battery and coil with breaker points make for reliable ignition. The motorcycle boasts kick starting and has a maximum power of 30 hp / 22.3 kW at 7500 rpm and a maximum torque of 21 lb-ft / 2.9 kgf-m at 7000 rpm. Its transmission consists of six-speed gears and its final drive is chain-driven. The bike offers telescopic fork and dual shock rear suspension and uses single 267mm disc brakes in both the front and rear. The front and rear tyres are 3.00S-18-4PR and 3.50S-18-4PR respectively. The motorcycle weighs 152 kg / 335 lbs and has a length of 1995 mm / 78.5 in, width of 830 mm / 32.6 in, and height of 1085 mm / 42.7 in. Its wheelbase stretches to 1325 mm / 52.1 in, while its ground clearance measures 150 mm / 5.9 in. Its fuel capacity is 16.5 liters / 4.2 US gal.

Technical specifications:

Make Model: Yamaha RD 250

Year: 1979
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