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M20/M21 ENGINE

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BSA BIGEND ROLLER
24-0375
!
24-0370 bigend roller for most BSA heavyweight singles 1/4 x 5/16”. You need 24 of these to fix your bigend bearing. Bag of 24.

BSA CRANKSHAFT BEARING
24-0722
!
Was BSA number 27-722. RHP number MRJA 7/8
size: 2 1/4” x 7/8” x 11/16”

DRIVE SIDE BEARING BSA SINGLES MRJA25
24-0724
!
25 X 62 X 17MM,  1 sided rollerbearing. Superblend
NF305C, Hoffman R325L
B50 and some B31/33, B40  and M models.
Make of bearing: NSK

DRIVE SIDE OIL FLINGER
24-2113
!
New Old Stock, still in factory grease.

BALL BEARING T/S
27-0261
!

Timing side bearing on most BSA pre unit singles. (7/8 x 2 1/4 x 11/16”)
MJ7/8

CRANKSHAFT RIVET
27-1239
!
Genuine BSA rivet for the singles  crankshaft.

BIGEND NUT
31-0298
!
NEW OLD STOCK

BIGEND M20/21, B31/33
65-0545
!
Genuine Alpha bearing (B14K), made in England.
Still some available.

LONG MAGDYNO STRAP
65-1888
!
BRITISH MADE, 208MM X 40MM, ZINC PLATED

CIRCLIP DRIVE SIDE

65-2240
!
Diameter 56,55mm

OIL SEAL MAGDYNO DRIVE
65-2316
!
 3/4 X 1 1/2 X 3/8"

SUMP GAUZE

65-2623
!

All pre unit BSA singles use this. Gaskets included.