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BSA UNIT BOITE
BSA unit singles have used  a confusing number of chain sizes, please check what size chain you need.
!

DRAIN PLUG GEARBOX, UNF THREAD

21-1857
!
bsaunitaftapplugbak_000
13TPI

6206

29-3857
!

30X 62 X 16
6206, LJ30
Sleeve gear/mainshaft BSA C15, B25, B40.
57-0665 Triumph 21, 3TA, 5TA, T100 units high gear/sleeve gear, behind rear sprocket.

KICKSTART QUADRANT BUSH

40-3272
!
Also 57-2686

KICKSTART SPRING UNIT SINGLES

40-3275
!
Triumph number 57-2687

KICKSTART LEVER UNIT SINGLES

41-3021
!

Alternative number 57-2764

For early C15  see 57-1679

HIGH GEAR BUSH

41-3045
!

FIRST GEAR 27T LAYSHAFT B25

41-3087
!

SPROCKET NUT UNIT SINGLES

57-1434
!

BSA number 40-3051
1 1/8" inner
1 7/16" outer

SPROCKET B25/44/50 WIDE 17T

57-1558
!
For wide chain 5/8" x 3/8" (or 530 in Japanese)

KICKSTART LEVER CUB/C15

57-1679
!

Folding kickstart lever, Cubs and early BSA C15
British Made
BSA number 40-3083

CIRCLIP ON LAYSHAFT

57-2669
!
Old number 41-3078

THRUST WASHER

57-2672
!
Old number 40-3279