AI
Bsa
B 20
Classic
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What should you pay for a B 20?
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Comparable models
Also worth considering
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Generations and editions
Features and handling differ by generation. Use this overview to find the right version.
1 variants
Years
1937 - 1938
1937–1938 B20 Tourer
GenerationThe B20 Tourer is the 249cc single-cylinder side-valve model in BSA's pre-war 250cc range. It was offered for 1937 and 1938 alongside the OHV B21 Sports and B22 Empire Star; do not merge those models automatically.
249 cc1 cyl.A2 suitable
About this model
About the Bsa B 20
The Bsa B 20 is classified in our catalogue as a classic motorcycle. The available catalogue data forms the technical basis of this model profile. Always verify model year, trim and technical values against the individual motorcycle, as they can differ between generations.
- Category
- Classic
Before you buy
What to check before buying
- First verify that it is truly a B20 Tourer: this is the 249cc side-valve model from 1937–1938, not the OHV B21/B22 or a later BSA single. Check frame and engine numbers with a BSA dating source.
- Check compression, valve clearance, carburettor and ignition when cold starting and once warm. On a pre-war side-valve single, calm and even running matters more than a quoted top speed.
- Inspect oil supply, leaks, return and change history. A machine that has stood needs fresh fuel and a controlled first start, but standing still does not automatically make it defective.
- Check chain drive, clutch, gearbox, brakes and wheels for safe operation; replace worn cables, tyres and brake linings according to condition rather than year alone.
- Inspect frame, forks, mudguards and fixings for corrosion, cracks and non-original alterations. Compare parts with the illustrated BSA instruction book for the 1937 250cc range.