Engine shock absorber

For primary chains click here; for alternators and fittings click here.
The pre-unit plunger and rigid A group uses a duplex chain sprocket, the first year of the swinging arm models used a 4 lobe shock absorber changing in 1955 to a 2 lobe one. The pre-unit singles all used the 4 lobe one up to 1954 and then a 2 lobe one, except the C group which dropped the shock absorber entirely in 1953 when an alternator was fitted. The B and M group did likewise when they gained alternators.
Any sprocket from the relevant section can be fitted; the listings are to show the original application. Overall gearing was usually altered by changing the engine sprocket.

Plunger A Group 1947-57

Part No

Description Per Model Years

35-0709

Retaining nut split pin 1 A Rig/Plun 1947-57

67-0349

Shim between drive side bearing and sprocket spacer 1 A 1949-53

67-1239

Shim between drive side bearing and sprocket spacer 1 A 1947-48

67-2052

Spring 1 A7/ST 1947-50

67-2053

Shock absorber sleeve 1 A Rig/Plun 1947-53

67-2054

Retaining nut 1 A Rig/Plun 1947-57

67-2055

Cush drive cam 1 A Rig/Plun 1947-57

67-2056

Sprocket shim, .005″ AR A Rig/Plun 1946-57

67-2057

Sprocket shim, .010″ AR A Rig/Plun 1946-57

67-2058

Sprocket shim, .030″ AR A Rig/Plun 1946-57

67-2062

Spring 1 A Rig/Plun 1950-57

67-2071

Shock absorber sleeve 1 A Rig/Plun 1954-57

4 Lobe 1954 Swinging Arm A Group, 1937-54 B/C/M Group

Part No

Description Per Model Years

15-0046

Spring 1 B20/21/22/23 1937-39

15-0046

Spring 1 C/G14/M20/21/Y13/G14 1937-54

15-1555

Cush drive cam 1 A/B/C/M 1937-54

15-1560

Sprocket, 21T 1 A S’arm 1954

15-1564

Sprocket, 20T M21/33 solo 1937-54

15-1565

Sprocket, 19T 1 B33/M 1937-54

15-1566

Sprocket, 18T 1 A7/SS/M20 solo 1954

15-1567

Sprocket, 17T 1 B31/C/M33 S’car 1937-54

15-1568

Sprocket, 16T 1 C/M20/21 S’car 1937-54

29-2634

Distance collar 1 C 1939-53

35-0709

Retaining nut split pin 1 A S’arm 1954

65-2519

Cush drive bearing sleeve 1 B/M 1937-39

65-2520

Retaining nut (C group up to 1953) 1 B/C/M 1937-54

65-2521

Retaining nut lockwasher (C group up to 1953) 1 A/B/C/M 1937-54

65-2523

Cush drive bearing sleeve 1 B/C/M 1946-54

65-2534

Cush drive bearing sleeve 1 WM20 1940-45

66-0661

Shim, drive side 1 B/M 1946-63

66-1705

Cush drive washer 1

66-1706

Spring 1 B24/25/26/M19/22/23/24 1937-40

66-1706

Spring 1 B 1946-54

66-1707

Alignment washer 1

67-1097

Cush drive bearing sleeve 1 A S’arm 1954

67-1098

Retaining nut 1 A S’arm 1954

67-2056

Sprocket alignment shim AR A 1955-62

67-2062

Spring 1 A S’arm 1954

2 lobe All Models 1955-63 Except when alternator fitted

Part No

Description Per Model Years

35-0709

Retaining nut split pin 1 A 1955-62

42-0069

Cush drive bearing sleeve 1 A 1956-62

42-0070

Cush drive cam 1 A/B/M 1956-62

42-0071

Retaining nut 1 A 1956-62

65-2520

Retaining nut 1 B/C/M 1955-63

65-2521

Retaining nut lockwasher 1 A/B/C/M 1955-63

65-2539

Cush drive bearing sleeve 1 B/M 1954-63

66-0661

Shim, drive side 1 B/M 1940-63

67-1134

Cush drive bearing sleeve 1 A 1955

67-1135

Cush drive cam 1 A/B/M 1955

67-1136

Spring 1 A/B/M 1955-62

67-1137

Retaining nut 1 A 1955

67-1138

Spacer 1 A 1955-56

65-2536

Sprocket, 16T, sidecar 1 M20/21 (B32 solo) 1955-63

65-2537

Sprocket, 17T, sidecar 1 M33 1955-57

65-2537

Sprocket, 17T, solo 1 Spitfire/B31 1955-63

67-1132

Sprocket, 18T, sidecar 1 A10/RR/SR 1955-62

67-1132

Sprocket, 18T, solo 1 A7/SS/M20 1955-62

45-2776

Sprocket, 19T, solo 1 B33 1955-57

65-2538

Sprocket, 20T, solo 1 B34/M21/33 1955-62

67-1133

Sprocket, 21T, solo 1 A10/RR/SR 1955-62

10470-54

Sprocket, 22T 1

65-2541

Sprocket, 23T 1

10471-54

Sprocket, 24T 1

Alternator Models

29-1999

Sprocket, 16T 1 C10L 1954-57

29-2034

Sprocket, 17T 1 C11G/C12 1954-58

42-0088

Sprocket, 19T 1 B33 1958-60

42-0089

Sprocket, 17T 1 B31 1958-60

66-0661

Shim, drive side 1 B 1958-60

124. Removing pulleys “Pulley is usually driven on to a taper shaft, held by a feather, and secured by a locknut. To remove locknut, fit big spanner on it, and tap butt of spanner with a hammer. Locknut being removed, run engine on stand, when pulley will usually swirl off and hit any fool in its line of travel.”

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