Pre-unit B GroupSee section 10 for notes on ‘long and short’ con-rod lengths. Standard bore sizes and piston to bore clearances for standard models are (Clearances in inches):- 350cc std bore = 71mm. Clearance std C.R. piston .004/.0055; high C.R. piston .003/.005; split skirt .0005/.0016.500cc std bore = 85mm. Clearance .0045/.0065; split skirt .0006/.00275 | |||
7150 | Piston 20 | B1, 2, 18, 20 | 1933-39 |
7131 | Piston, STD, 30, 40 | B2, 22 | 1937-38 |
8317 | Piston, 71mm, 7.5:1 STD, 20, 40 | All ohv 350cc | 1933-60 |
681 | Liner (plain liner, not flanged) | Bl, 2, 3, 4, 18, 20, 21, 22 | |
10962 | Piston, 71mm STD, 20, 40, 60, 80 | B | |
7094 | Piston, STD, 20, 30, 40, | B23 | 1937-39 |
15504 | Piston, c.r. 6.5:1, STD, 20, 30, 40, 60 | B23, 26, 30, 31, 32 | 1937-60 |
13165 | Piston, c.r. 6.5:1, STD, 40 | B32 | 1954-59 |
18527 | Piston c.r. 9:1, 40 only (long con-rod) | B34 | 1954-62 |
13052 | Piston c.r. 9:1, STD, 20, 40, 60, 80 (long con-rod) | B34 | 1954-62 |
11341 | Piston, c.r. 6.8:1, STD, 20, 40, 60 (long con-rod) | B33, 34 | 1946-52 |
11744 | Piston, c.r. 7.5:1, STD, 20, 40, 60 (short con-rod) | B33 | 1952-60 |
12010 | Piston, c.r. 8.5:1, STD, 20, 40, 60 (long con-rod) | B33, 34 | 1946-52 |
R3660 | Piston rings, STD, 20, 30, 40, 60 | B23, 26, 30, 31, 32 | 1937-60 |
R3680 | Piston ring set, STD, 20, 40, 60 | B33, 34 | 1946-60 |
65-0440 | Gudgeon pin | B23-26, 30, 31, 32 | 1937-60 |
66-0953 | Gudgeon pin | B33, 34 | 1937-60 |
66-0954 | Circlip | B23-26, 30-34 | 1937-60 |
734 | Cylinder liner | B31, 32 | 1946-60 |
2107 | Cylinder liner, cast iron barrels | B33, 34 | 1946-60 |
2112 | Cylinder liner, alloy barrels | B33, 34 | |
2558 | Cylinder liner, alloy barrels | B32 | |
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