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Yamaha RD 250LC

Model	Yamaha RD 250LC / RZ 250LC
Year	1980
Engine	Two stroke, parallel twin
Capacity	247 cc / 15.0 cu-in
Bore x Stroke	54 х 54 mm
Cooling System	Liquid cooled
Compression Ratio	6.2 :1
Lubrication	Autolube
Oil Capacity	1.6 Litres
Induction	2x Mikuni VM28 SC carburetor
Ignition	CDI
Starting	Kick
Max Power	35.5 hp / 26.1 kW @ 8500 rpm
Max Torque	30.2 Nm / 3.1 kgf-m@ 8000 rpm
Clutch	Wet multi-plate
Transmission	6 Speed
Final Drive	Chain
Front Suspension	Telescopic forks
Rear Suspension	Monocross
Front Brakes	Single 267mm disc
Rear Brakes	Drum
Front Tyre	3.00-18
Rear Tyre	3.50-18
Dimensions	Length 2080 mm / 81.8 in Width 750 mm / 29.5 in Height 1090 mm / 42.9 in
Wheelbase	1360 mm / 53.5 in
Seat Height	785 mm / 30.9 in
Ground Clearance	165 mm / 6.4 in
Dry Weight	139 kg / 306.4 lbs
Fuel Capacity	16.5 Litres / 4.3 US gal
Consumption Average	40 mpg
Standing ¼ Mile	14.6 sec
Top Speed	98 mph / 157.7 km/h

This was a supersport model developed with the TZ250 as its base. It immediately created a big sensation after its stunning debut at the 1979 Tokyo Motor Show. Its liquid-cooled 2-stroke, 2-cylinder engine pumped out high power equivalent to 140 hp per liter of displacement.

This was mounted on a double cradle frame with a Monocross suspension and other features like lightweight cast wheels to produce unprecedented running performance. Even today it remains a legendary model with a devoted following.

Almost as quick as its 350 brother, the 250LC earned extra notoriety in 1980 with a top speed in excess of 100mph. Fond parents said that selling a 250 as fast as this was tantamount to Yamaha inviting the (British) nation's youth to commit hara-kiri in the run up to the L-test. It all added up to a very effective send-off for the LC, which (of course) became overnight the learner's favourite bike.

Based — but very loosely, like the 350LC — on the layout of Yamaha's five-year-old watercooled racers, the 250 had a reed valve as an aid to easy induction and separate barrels where the competition TZ had had the pair as one unit; an obvious similarity was the water impeller driven from the right end of the crankshaft. Ports were smaller on the road bike, as were the Mikuni carburettors.

Cylinder head design, too, was different.
But in concept, and looks, the LC displayed much of the racer's style. Its performance was ahead of that of the earlier air-cooled RD, which in its day was reckoned to be king of the 250s, in speed if not in sales.