1945 BSA B31. Rare Early Model The BSA & Military Bicycle Museum

16 Май 2015 | Author: | Комментарии к записи 1945 BSA B31. Rare Early Model The BSA & Military Bicycle Museum отключены
BSA Prototype

1945 BSA B31. Rare Model

1945 BSA B31. Early Model


Though this is essentially a website, this machine is a 1945 BSA and was my daily rider in A few pages about BSA’s production provides additional to the company’s wartime history.

I like about this model is that it’s different from other It’s more lightweight subsequent models, and sits to the ground. The speedo is in the tank.

It has some special wartime such as different levers and forks without a drain

The BSA B31 was designed before the end of WW2 and introduced as as the war finished, so it’s also a BSA of significance.


In both world BSA totally mobilized for war production. though all essential industry was in such circumstances, these companies also had to plan postwar strategies. From in a small building in Redditch, by the Ministry men at Small Heath, BSA the machines that would their debut when was declared.

The B31 was based on the B29 Silver which had been introduced in Only a few of these had been before the company turned to war and the B29 was subsequently modified to become the a prototype 350cc light motorcycle. Trials of this new machine were satisfactory, but the War Office decided they had enough military models and keep the range as simple as

So the militasry B30 never went production.

There were two differences between the B29/B30 and the The major change was the telescopic forks that replaced the forks of prewar models. Edward Turner had joined BSA as a and he introduced oil valve springs; the hairpin valve springs more room without performance.

The B31 had a stronger and more crankcase than BSA’s prewar 350cc ohv, the Star. The semi-cradle frame was stronger, even though it was than that fitted to the There were no sidecar as the M20 and M21 were designated as BSA’s models.

The M20 was available immediately after the but the B31, along with the new C10 and only became available in and October 1945. However, all were for export only. a huge national debt to very few new vehicles could be in Great Britain.

SUMMARY . B31 is in excellent all-round condition, most of the cosmetics unrestored. I bought it, it had been mechanically However, previous ‘restorations’ are good enough for my mechanic, and he through everything so it met his high standard.

Relevant Points:

1. It wet You can buy a kit to deal with this, I just drain the oil if it’s standing and recycle it.

BSA Prototype

2. The kickstart rubber was sliding off the kickstart; my mechanic has araldited it on. It had tape on it in these photos to it in place while the glue

3. The rear light is a later I intended replacing it with a early one.

4. The decompressor works fine, but is not the correct likewise the throttle. But it’s not to find correct items.

5. It has no cable, but I recently ordered one Draganfly, so that will go the bike.

The petrol tank has minor dings and dents, as expect, and the chrome is pitted and there.

Of course, this is not a concours Apart from the tank, has been resprayed, all the metalwork is in original unrestored ‘oily condition. To my eye, it looks like this.

It’s difficult to find ‘unmolested’ what’s the point in paying for else’s restoration work if standards are high and therefore to restore it all over again?

The was totally rebuilt; the magdyno has done too; clutch and are good, with all gears well; new regulator box good the silencer is a new M21 one sleeved onto a B31 pipe; brakes renewed but brake needs bedding in; in good condition; new tyres; handlebars with genuine wartime levers.

I’ve been riding it. It very well. So it’s ready to jump on and use.

frame number XB31.1221 original (early) engine

BSA Prototype
BSA Prototype
BSA Prototype
BSA Prototype

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