First year for this solid, dependable, OHV single. It's arguably the most handsome of the B-series pre-unit singles and represents what BSA did best, which was to provide fairly ordinary bikes …

The BSA B31, introduced in 1945, was the first new model introduced by the company after the Second World War. Based on pre-war designs, it used a single cylinder four stroke engine that …

Jan 13, 2016 · The 1949 BSA B31 has at its heart an air-cooled, four-stroke, 348cc, single cylinder powerhouse mated to a four-speed manual transmission that can produce a claimed …

Jan 5, 2022 · BSA came out of the war with a reliable side valve single, the M-series, which had been well and truly tested in the toughest of environments. Its first new postwar bike was the …

Jul 10, 2013 · The engine and gearbox lived up to BSA’s reputation for durability, needing nothing more than the usual rebore/piston and a complete set of bearings. The big-end was a …

Vehicle history and comps for 1953 BSA B31/B33 - including sale prices, photos, and more.

Oct 23, 2013 · BSA B31 350cc single From the restorer’s point of view, the big advantage of a bike such as BSA’s daily-workhorse 350cc B31 single, is that it remained in produc­tion for so …

Need help? Do you have a question about the B31 and is the answer not in the manual?

Apr 19, 2024 · Although it used mainly B31 parts, the new sports model had lighter chrome plated mudguards, lower gearing for motocross and trials, a smaller fuel tank with the speedo …

Jul 7, 2014 · Find this BSA B31 for sale in Tucson, Arizona with bidding up to $3,650 and the reserve not yet met here on eBay. BSA's first new model after WWII, the B31 was a single …