Pre-unit C Group

The side valve models started with a cast iron head but changed to aluminium alloy in 1949 after ZC10 1377, fining was increased in 1956. The ohv models stuck with cast iron, fining increased in 1951. The C11G and C12 had a different head stud arrangement.

For gasket see here

Part No

Description

Per

Models

Years

Cylinder head – Used available, please enquire

Cylinder – Used available, please enquire

PACK-INTER-002

Top end overhaul packAAllAll

BC11

Bottom ends, cranks and crankcases, various conditions1C11/G

01-1796

Head stud nut5C111949-53

02-0046

Cylinder head stud nut5C11G/121954-58

02-0049

Carburettor fixing nut2C1946-58

02-0049

Cylinder head stud nut2C11/11G/121949-58

02-0049

Head steady nut2C1954-58

02-0923

Head bolt washer8C101949-53

02-0923

Head steady to head plain washer1C10L1954-57

15-5155

Carburettor stud plain washer2C10/111946-49

15-1367

Carburettor stud2C1949-58

24-8328

Cylinder head timing bolt1C10/10L1949-57

27-5156

Cylinder head bolt5/4C10/10L1940-57

27-6260

Cylinder head bolt, short3C10/10L1949-57

24-8784

Carburettor stud spring washer2C1950-58

24-8784

Head steady to head spring washer1C1954-58

24-8784

Head steady to frame spring washer1C1954-58

29-1950

Cylinder1C11G/121954-58

29-1954

Cylinder head1C11G/121954-58

29-1956

Head stud5C11G/121954-58

29-1957

Head stud2C11G/121954-58

29-2017

Head bolt washer8C10L1954-57

29-2033

Head bolt to head steady (extended head)1C10L1954-57

29-2259

Head stud5C111939-53

29-2335

Cylinder head1C10/111949-55

29-2345

Cylinder barrel, various conditions1 C11

29-2346

Head stud2C111950-53

29-2544

Cylinder1C10/111949-55

29-2547

Cylinder1C10L

29-2550

Tappet cover1C10/121940

29-2554

Tappet cover1C101946-53

36-0382

Carburettor stud shake proof washer2C10/111946-49

36-0382

Cylinder head stud shake proof washer2C11/11G/121949-58

36-0399

Head stud spring washer5C111949-53

65-0042

Tappet guide2C10/10L1939-57

66-1933

Tappet cover screw4C10/111949-57

66-4707

Cylinder head stud shake proof washer5C11G/121954-58

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