The BSA Sunbeam (Triumph Tigress) is a motorcycle produced from 1959 to 1961 with a twin 4-stroke engine and a capacity of 250 cc. There is also a 175 cc version available. The carburetor used is a Zenith 18 MXZ and the cooling system is air cooled. The lubrication is dry sump with an oil capacity of 1.4 L. The exhaust is a single, stainless steel pipe and the ignition system is twin coil. The Sunbeam is equipped with a Champion L7 spark plug with a gap of 0.020 in. It has a 12V battery and uses a kick start (some models were fitted with an electric start) for starting. The clutch is a dry, single plate with a 4-speed transmission and a chain final drive. The frame is made of pressed sheet metal and the front suspension has 2 telescopic legs mounted side by side on the left-hand side while the rear suspension is a swinging arm. The front and rear brakes are both drums, and the wheels are steel and interchangeable. The average fuel consumption is 2.4 L/100 km and the top speed is 97 km/h. It comes in two colours: polychromatic green and red/beige.
Technical specifications:
Make Model: BSA Sunbeam (Triumph Tigress)
| Year | 1959 – 61 |
|---|---|
| Engine | Twin, 4-stroke (175cc: single, 2-stroke) |
| Capacity | 250 cc / 15.3 cub in. (also in 175 cc /10.7 cub in.) |
| Carburetor | Zenith 18 MXZ |
| Cooling System | Air cooled |
| Lubrication | Dry sump |
| Oil Capacity | 1.4 L / 3 US pints |
| Exhaust | Single, stainless steel |
| Ignition | Twin coil |
| Spark Plug | Champion L7, gap 0.020 in. |
| Battery | 12V |
| Starting | Kick start (some fitted with electric starter) |
| Clutch | Dry single plate |
| Transmission | 4 Speed, foot operated |
| Final Drive | Chain |
| Frame | Pressed sheetmetal |
| Front Suspension | 2 telescopic legs mounted side by side on the LHS |
| Rear Suspension | Swinging arm |
| Front Brakes | Drum |
| Rear Brakes | Drum |
| Wheels | Steel, interchangeable |
| Front Wheel | 10 in. |
| Rear Wheel | 10 in. |
| Fuel Capacity | 6.8 L / 1.8 US gal |
| Average Fuel Consumption | 2.4 L/100 km / 41. 7 km/l / 98 US mpg |
| Top Speed | 97 km/h / 60 mph |
| Colours | Polychromatic green, Red/beige |
| Review | Wikipedia |
