The BSA parts book is re-produced below to assist owners in finding the correct part number for the parts they require.

1. 71-2088 Exhaust pipe stud x 2
2. 71-1414 Exhaust pipe flange washer x 1
3. 60-2338 Washer, exhaust pipe mounting (1/4″ x 5/8″ x . 056″) x 2
4. 14-1201 Nut, exhaust pipe mounting (1/4″ unified fine) x 2
5. 19-9871 Cylinder barrel x 1
6. 19-9891 Sealing washer, decompressor x 1
7. 19-9890 Decompressor complete x 1
8. 19-7633 Spark plug (Champion L81) x 1
9. 19-9896 Spark plug, cover x 1
10. 19-9876 Nut, cylinder head stud (6 mm.) x 4
11. 19-9875 Spring washer, cylinder head stud (6 mm.) x 4
12. 19-9874 Washer, cylinder head stud (12 x 6’x 1.5 mm.) x 4
13. 19-9872 Cylinder head x 1
14. 19-9887 Flywheel nut (10 x 1 mm.) x 1
15. 19-9886 Lockwasher, flywheel nut (10 mm.) x 1
16. 19-9885 Washer, flywheel nut (18 x 10 x 1.5 mm.) x1
17. 19-9892 Flywheel magneto complete x 1
17. 19-9893 Magneto flywheel only x 1
18. 19-9897 Screw, coil mounting (22 x 4 mm.) x 4
19. 19-9884 Flywheel key x 1
20. 19-9903 Screw set, contact breaker x 1
21. 19-9902 Contact set x 1
22. 19-9899 Washer, coil mounting (4 mm)x 4
23. 19-9895 High-tension lead x 1
24. 19-9898 Cover, high-tension lead x 1
25. 19-9900 High-tension coil x 1
26. 19-9863 Crankcase screw (45 x 5 mm.) x 6
27. 19-9850 Crankcase x 1
28. 19-9862 Cylinder stud x 4
29. 19-9861 Grommet, high-tension lead x 1
30. 19-9860 Grommet, lighting lead x 1
31. 19-9879 Circlip, gudgeon pin x 1
32. 19-9878 Gudgeon pin x 1
33. 19-9881 Bearing, connecting rod small-end x 1
34. 19-9867 Crankcase dowel x 2
35. 19-9877 Piston complete (standard) x 1
35. 19-9975 Piston complete (first oversize 0.25 mm.) x 1
35. 19-9976 Piston complete (second oversize 0.50 mm ) x 1
36. 19-9880 Piston ring (standard) x 2
36. 19-9977 Piston ring (first oversize 0.25 mm.) x 2
36. 19-9978 Piston ring (second oversize 0.50 mm ) x 2
37. 19-9873 Cylinder base gasket x 1
38. 19-9850 Crankcase x 1
39. 19-9856 Circlip, crankcase x 1
40. 19-9857 Oil seal x 1
41. 19-9884 Key, clutch spring housing x 1
42. 19-9961* Clutch spring housing x 1
* Now comprises two parts:
*19-9961 Dish For Clutch spring
*19-9979 Hub for clutch spring dish

43. 19-9970 Clutch spring with balls x 1
44. 19-9962 Clutch hub x 1
45. 19-9889 Lockwasher, clutch nut x 1
46. 19-9888 Clutch nut (15 x 1 mm.) x 1
47. 19-9968 Circlip, pulley and fan (13 x 1 mm.) x 1
48. 19-9966 Spacing washer (0 3 mm.) as reqd.
48. 19-9967 Spacing washer (0.5 mm.) as regd.
49. 19-9960 Pulley and fan complete with bearing x 1
50. 19-9914 Bolt, layshaft housing mounting plate (6 mm.) x 4
51. 19-9974 Pulley bearing (Torrington RGB.08-1214) x 1
52. 19-9965 Facing washer x 2
53. 19-9913 Mounting plate, layshaft housing x 1
54. 19-9855 Mounting plate washer x 4
55. 19-9870 Mounting plate nut (6 mm.) x 4
56. 19-9882 Crankshaft complete x 1
57. 19-9883 Ball bearing (42 x 15 x 13 mm.) x 2
58. 19-9851 Crankcase gasket x 1
59. 19-9866 Gasket, induction pipe to membrane x 1
60. 19-9853 Inlet membrane complete x 1
61. 19-9852 Gasket, membrane to crankcase x1
62. 19-9854 Induction pipe x 1
63. 19-9864 Oil seal x 1
64. 19-9894 Stator plate complete x 1
65. 19-9905 Lighting coil x 1
66. 19-9906 Oil wick for cam x 1
67. 19-9907 Condenser x 1
68. 19-9899 Washer, stator plate screw (4 mm.) x 3
69. 19-9901 Screw, stator plate (15 x 4 mm.) x 3
70. 19-9945 Air intake tubing (110 x 16 x 21 mm.) x 1
71. 19-9865 Magneto cover spring clip x 2
72. 19-9858 Magneto cover x 1
73. 19-8696 Final drive chain x 1
74. 60-2324 Washer, layshaft nut (1/2″ x 1″x 092″) x 1
75. 70-9313 Ballrace, layshaft housing x 2
76. 14-0225 Bolt, layshaft housing (5/16″ unified fine x 3″) x 2
77. 19-9926 Carburetter complete x 1
78. 19-9870 Nut, induction pipe mounting (6 mm.) x 2
79. 19-9869 Stud, induction pipe mounting (18 x 6 mm.) x 2
80. 19-9855 Undulated washer, induction pipe x 2
81. 14-0401 Locknut (1/4″ unified fine) x 1
82. 21-2046 Sleeve nut (1/4″ unified fine) x 1
83. 19-9972 Clutch plate x 2
84. 19-9973 Clutch friction plate x 1
85. 19-9964 Pressure spring x 1
86. 19-9963 Locking plate x 1
87. 19-9969 Screw, locking plate (18 x 5 mm.) x6
88. 60-2511 Circlip, sliding member x 1
89. 57-4123 Spring, sliding member x 1
90. 57-4105 Sliding members x 1
91. 60-2510 Circlip, layshaft x 1
92. 57-4138 Blind bush, layshaft x 1
93. 14-1202 Nut, layshaft housing (5/16″ unified fine) x 2
94. 57-4122 Support washer, layshaft x 1
95. 57-4137 Layshaft pulley (49 teeth) x 1
96. 57-4108 Thrust washer, layshaft x 1
97. 57-4140 Primary belt x 1
98. 57-4132 Layshaft housing assembly x 1
99. 57-4181 Layshaft x 1
100. 37-3544 Felt washer, layshaft x 2
101. 57-4259 Grease retainer, layshaft x 2
102. 57-4136 Layshaft sprocket (12 teeth) x 1
103. 14-1205 Sprocket nut, layshaft (1.2″ unified fine) x 1