Yamaha SR250: review, history, specs

**Yamaha SR250**
Manufacturer	Yamaha
Also called	SR250 Custom
Production	1978 - 1983
Class	Classic
Engine	single cylinder, four-stroke
Bore / Stroke	73.5mm x 56.5mm
Compression ratio	8.9:1
Top speed	71 mph (115 km/h)
Horse Power	16.63 HP (12.4 KW) @ 7400RPM
Torque	14.01 ft/lbs (19.0 Nm) @ 7000RPM
Sparkplug	NGK BP7ES '80-82
Battery	YUASA 12N12A-4A-1 '80-82
Transmission	Gear box: 5-speed ; Final Drive: chain ; Clutch: Wet multi-plate ;
Suspension	Front: Telescopic Forks ; Rear: Dual Shock
Brakes	Front: expanding brake ; Rear: expanding brake
Front Tire	3.00-19
Rear Tire	120/90-16
Wheelbase	52.8 inches (1341 mm)
Seat height	29.09 inches (739 mm)
Weight	(dry), 135.0 kg (wet)
Fuel capacity	2.64 Gallon (10.00 Liters)
Related	Yamaha XT250
Manuals	Service Manual
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The Yamaha SR250SE was a single cylinder, four-stroke Classic motorcycle produced by Yamaha between 1978 and 1983. It could reach a top speed of 71 mph (115 km/h). Max torque was 14.01 ft/lbs (19.0 Nm) @ 7000 RPM. Claimed horsepower was 16.63 HP (12.4 KW) @ 7400 RPM.

Engine

The engine was a air cooled single cylinder, four-stroke. A 73.5mm bore x 56.5mm stroke result in a displacement of just 240.0 cubic centimeters. Fuel was supplied via a overhead cams (OHC).

Drive

The bike has a 5-speed transmission. Power was moderated via the Wet multi-plate.

Chassis

It came with a 3.00-19 front tire and a 120/90-16 rear tire. Stopping was achieved via expanding brake in the front and a expanding brake in the rear. The front suspension was a Telescopic Forks while the rear was equipped with a Dual Shock. The SR250SE was fitted with a 2.64 Gallon (10.00 Liters) fuel tank. The wheelbase was 52.8 inches (1341 mm) long.

1978 - 1982 Yamaha SR 250

The Yamaha SR 250 has the same engine from XT250, single side drum front brake and some other components, such as the sanil-type rear chain adjuster, showed similar trail antecedents.

1982

1982 Yamaha SR250 in Blue

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