1951 BSA B31

“ The odo states 15 however, we think it's done more like 3,000. In need of recommissioning. ”
The 'thumper' turns nicely on the kick-starter.

Background
BSA's rugged, workaday B31 single cylinder ‘Thumper’ was manufactured from 1945 to the end of 1959, its overhead-valve engine providing the basis for the renowned Gold Star sports roadster.

At the time of its introduction, the B31 was BSA's sole all-new model, joining the lightweight 'C' and heavyweight 'M' ranges carried over from pre-war days.

Produced initially with rigid frame and telescopic front fork, the B31 gained (optional) plunger rear suspension in 1949 and an all-new swinging-arm frame in '54. In 1947 it had been joined by 500cc development, the B33, the engine of which closely followed B31 lines but with larger (85mm) bore and heavier flywheels.

Cycle parts were identical apart from a larger-section rear tyre. A good all-round performer by the standards of its time, the B31 could cruise comfortably all day at 60mph while returning 75-plus miles per gallon, virtues that endeared it to private owners and police forces alike.

This much loved and highly successful model was last produced in 1959, its place in the BSA range being taken by the unitary construction B40.

Overview
This bike’s very good condition suggests that it’s been restored at some point but, even so, we and the vendor are pretty confident that the current odometer reading of 15 miles is at least 3,000 miles out of kilter with reality.

We know that the engine turns over but, following a period of inactivity, the motorcycle will require recommissioning to a greater or lesser extent before returning to the road and thus is sold strictly as viewed.

Estimate: £2,000 - £4,000

View the current bidding price for this motorcycle HERE