Yamaha xs250 (1977-81)

The Yamaha XS 250 is a motorcycle that was produced from 1977-1981. It has a 248cc, four-stroke, 180-degree parallel twin engine with a SOHC and two valves per cylinder. The bike has a bore and stroke of 55 x 52.4mm and a compression ratio of 9.6:1. The lubrication system is a wet sump and it has 2x 32mm Mikuni carburetors for induction. The ignition system is a coil and cb and starting is via a kick. The maximum power output is 27 hp at 9500 rpm and the maximum torque is 2.2 kgf-m at 8500 rpm. It has a wet multiplate clutch and a 6-speed transmission with a chain final drive. The frame is a duplex cradle and the suspension consists of telescopic forks on the front and dual shocks, swing arm, and 5-position preload adjustable on the rear. The bike has a single 267mm disc brake on the front and a 178mm drum brake on the rear. Front and rear tires are 3.00-18 and 3.50-18, respectively. The wheelbase measures 1359mm and the seat height is 810mm. The bike has a dry weight of 165.5 kg and a wet weight of 174 kg, with a fuel capacity of 14 liters. It was reviewed alongside the Kawasaki Z250 and the Honda CB250N in a 1979 issue of Which Bike magazine.

Technical specifications:

Make Model: Yamaha XS 250

Year: 1977 – 81

Engine: Four stroke, 180 degrees parallel twin, SOHC, 2 valves per cylinder
Capacity: 248 cc / 15.2 cu-in
Bore x Stroke: 55 52.4 mm
Cooling System: Air cooled
Compression Ratio: 9.6:1
Lubrication: Wet sump
Induction: 2x 32mm Mikuni carburators
Ignition: Coil and cb
Starting: Kick
Max Power: 27 hp / 20.1 kW @ 9500 rpm
Max Torque: 2.2 kgf-m / 15.9 lb-ft @ 8500 rpm
Clutch: Wet multiplate
Transmission: 6 Speed
Final Drive: Chain
Frame: Duplex cradle

Front Suspension: Telescopic forks
Rear Suspension: Dual shocks, swing arm, 5-position preload adjustable
Front Brakes: Single 267mm disc
Rear Brakes: 178mm Drum
Front Tyre: 3.00-18
Rear Tyre: 3.50-18
Wheelbase: 1359 mm / 53.5 in
Seat Height: 810 mm / 31.8 in
Dry Weight: 165.5 kg / 365 lbs
Wet Weight: 174 kg / 392.4 lbs
Fuel Capacity: 14 Litres / 3.7 US gal
Road Test: Yamaha XS250. Kawasaki Z250. Honda CB250N. Which Bike 1979

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