!950 b31 petrol tank

[DEDGE]

Hi Guys
I need some advice about the petrol tank that come on my bike ,the frame is a 1949 plunger. Is it the right tank if it isn’t what is the difference.  As I am trying to fit a solo saddle I thought I had better check that the tank is ok size wise and shape etc.
All The best
Dedge

[Bles31]

This is the tank on my 1952 plunger B31.

[Bles31]

There are a few different part numbers in mu BSA Parts Llist (for 1949 - 1952 B31's, Gold Stars and others). I attach the information - but find it hard to be sure which tank is used on which bike - rigid, plunger or Gold Star.

[Bles31]

From another section of the parts list. Hope this is of some use.

[JulianS]

These photos are from the parts book issued in 1949 and may assist.

[DEDGE]

Hi Guys
Thanks for all the info. My tank has the small oblong BSA badge with wing. Underneath at the front there is a link pipe connecting the two sides of the tank. According to Julian’s parts book this link pipe was only fitted on the M series part No 66-8285, my sprung 31 should have tank part No           65-8161.
Does anyone know what the physical difference is between the two tanks. The reason I ask is that the tank needs re chroming and repainting if spend the money on this tank will it look right or should I look for the right tank

Dedge