Engine sprocket. 2 lobe. Choose your number of teeth: 16, 17, 18, 19, 20, 21, 22, 23 or 24
BSA A7, A10
Chain: 1/2 x 5/16 | 428 | 110046
Part numbers: 16T 65-2536uk | 17T 65-2537 | 18T 67-1132uk | 19T 45-2776uk | 20T 65-2538uk | 21T 67-1133uk | 22T 45-2774uk | 23T 65-2541uk | 24T 45-2775uk