B33 499cc ohv single || 420Ib || 70mpg || 80mph || 1947-59

An enlarged B31 with more torque and longer legs. Possibly the classic 1950s workhorse, this one will run and run. They had plunger suspension from 1949, then the excellent BSA swinging arm frame arrived in 1955. Further upgrades gave them an alternator and coil ignition in 1958. There is an M33 version, which is a B33 engine in a side valve M21 frame. Like the B31, the B33 is a solid bet for any beginner.