BSA Bantam

BSA Bantam
	D1 Bantam in Mist Green
Manufacturer	BSA
Production	1948–1971
Engine	single-cylinder two-stroke:; 123 cc (D1); 148 cc (D3); 173 cc (D5 onwards)
Bore / stroke	52 mm / 57 mm / 61.5 mm × 58 mm (2.05 in / 2.24 in / 2.42 in × 2.28 in)
Power	4.5 bhp (3.4 kW) (D1); 5.3 bhp (4.0 kW) (D3); 7.4 bhp (5.5 kW) (D5 and D7); 10 bhp (7.5 kW) (D10); 12.6 bhp (9.4 kW) (D14/4 and D175 / B175)
Transmission	Three speed gearbox (D1 to D10) Four speed gearbox (D10 to B175)
Weight	375 pounds (170 kg) (dry);
Fuel capacity	1.75 imp gal (8.0 L; 2.10 US gal) (D1 and D3); 2 imp gal (9.1 L; 2.4 US gal) (D5 and D7); 1.9 imp gal (8.6 L; 2.3 US gal) (D7 Deluxe onwards)
Fuel consumption	100–125 mpg

The BSA Bantam is a two-stroke unit construction motorcycle that was produced by the Birmingham Small Arms Company (BSA) from 1948 (as a 123 cc) until 1971 (as a 173 cc). Exact production figures are unknown, but it was between 350,000 and 500,000.^[1]