B31/B33/34/M33

These overhead valve machines (with iron cylinder and iron head) were made between 1946 and 1962. Rigid frames, plunger and swinging arm.
Many parts interchange with 2 cylinder A7 and A10 and M20 and M21 sidevalves and Gold Stars. If you can't find it here, type an original part number in the finder...
The swinging arm models use the STD gearbox
The rigid frame bikes share the gearbox with M20

INLETRUBBER 42-4568 ! Inletrubber for B31 and B33 swinging arm models (1954>)

OIL LINE 65-1218 ! Return line on B31 and B33 in plungerframes.

REAR BRAKE SHOES 65-5901 ! Fit most  B31-A10 models 180 x 28mm

BRAKE DRUM 65-6294 ! Brake drum and sprocket for B31/33 plungerframe. Narrow sprocket, 5/8 x 1/4", 42T. Quickly detachable, large centre hole. Bolts: 67-3038 British Made.

OIL LINES PLUNGER SINGLES/TWINS BSA892 ! Oil lines for the plungerframe singles and twins Includes BSA# 65-8420, 65-8424, 65-8465.