Pre-Unit A Group

For gaskets click here; for rocker oil feed pipes click here; for cylinder liners and pistons click here; for cam followers and push rods click here; for push rod covers click here.

The 1947-51 long stroke A7 had a cast iron head with a separate inlet manifold and 2 rocker boxes and the cylinder does not have the tappets mounted in it. The 1950-53 A10 and 1952-53 A7 were fitted with a cast iron head with integral inlet manifold and a 1-piece rocker box, tappets in cylinder. In 1954 the fin area was increased for the A7, Star Twin and A10 models. In the same year the A7SS had an alloy head with a separate inlet manifold until 1955 when it became integral. Also in 1954 the Road Rocket gained an alloy head and the famous thick flange cylinder, which is ½” thick instead of 3/8”, this was fitted to the all 650cc models from 1958. There are variations of inlet size.
Part No	Description	Per	Models	Years
PACK-INTER-002	Top end overhaul pack	A	All	All
01-4676	Tappet securing screw ball bearing	1	A	1950-62
02-0049	Carburettor fixing nut	2	A7SS/A10SR/Spitfire/RGS	1954-62
02-0129	Carburettor fixing bolt	2	A7ST	1949-51
02-0129	Carburettor fixing bolt (not long stroke A7)	2	A7/A10/A10RR	1950-62
02-0923	Head steady and rocker box bolt plain washer	2	A S’arm	1954-59
02-2138	Head bolt washer	9	A	1954-62
15-1355	Head steady bolt to frame	1	A S’arm	1954-59
15-1367	Inlet manifold stud	4	A7	1947-51
15-2018	Head steady bolt to frame	1	A	1960-62
21-2902	Carburettor fixing bolt	2	A7	1947-51
24-0563	Inlet manifold nut	4	A7	1947-51
24-5160	Cylinder base nut (8 per 1947-49, 9 per 1950-62)	8/9	A	1947-62
24-6040	Head steady and rocker box thin nut	4	A Plun/Rig	1947-57
24-6040	Head steady bolt nut	2	A S’arm	1954-62
24-8784	Head steady and rocker box bolt spring washer	2	A S’arm	1954-62
24-8784	Head steady bolt spring washer	2	A S’arm	1954-59
29-0565	Carburettor fixing stud	2	A7SS	1954-62
36-0382	Inlet manifold shake proof washer	4	A7	1947-51
36-0382	Carburettor bolt shake proof washer	2	A	1947-62
36-0382	Head steady and rocker shake proof box washer	2	A Plun/Rig	1947-57
36-0382	Head steady bolt shake proof washer	2	A S’arm	1960-62
42-0051	Head steady spacer	1	A	1960-62
42-0052	Head steady L/H bracket to rocker box	1	A S’arm	1954-62
42-0053	Head steady R/H bracket to rocker box	1	A S’arm	1954-62
42-0054	Head steady spacer	1	A S’arm	1954-59
42-0055	Head steady bracket to frame	2	A S’arm	1954-62
42-0056	Head steady bracket bolt	1	A S’arm	1954-62
42-0062	Head steady and rocker box bolt	2	A S’arm	1954-62
42-0180	Cylinder head, iron, square fin, 1-1/8″ inlet	1	A10	1961-62
67-0050	Cylinder, various bore sizes	1	A7 Long Stroke	1947-51
67-0035	Inlet manifold	1	A7	1947-51
67-0071	Head stud	2	A7 Long Stroke	1947-50
67-0072	Cylinder head bolt	7	A7/ST	1947-50
67-0075	Cylinder head to barrel nut	2	A7	1947-50
67-0076	Compression plate (decompression really)		A7	1947-50
67-0079	Head steady stay	2	A Rig	1947-51
67-0120	Carburettor drip tray	1	A7/10	1947-62
67-0250	Head, Iron, NEW	1	A10	1949-53
67-0250U	Head, Iron, used	1	A10	1949-53
67-0254	Head bolt, iron head, long	4	A7/ST/10	1950-62
67-0258	Head bolt, iron head, medium	2	A7/ST/10	1950-62
67-0276	Tappet securing screw, top, thin flange barrel	1	A7/ST/SS/10/SF/RR	1950-62
67-0283	Head bolt, iron head, short	3	A7/ST/10	1950-62
67-0299	Tappet securing screw, side	2	A	1950-62
67-0331	Tappet locating pin	1	A	1950-62
67-0346	Head steady bracket to frame	2	A Plun/Rig	1949-57
67-0347	Carburettor fixing stud	2	A10SR/Spitfire/RGS	1958-63
67-0380	Cylinder head, round fin	1	A7	1951-52
67-0949	Tappet securing screw, top	1	A10/SR	1958-62
67-1061	Cylinder head, iron, square fin	1	A7	1954-62
67-1065	Cylinder head, iron, square fin	1	A10	1954-58
67-1114	Head bolt, alloy head, short	3	A7SS/10RR/SR	1954-62
67-1115	Head bolt, alloy head, medium	4	A7SS/10RR/SR	1954-62
67-1116	Head bolt, alloy head, long	2	A7SS/10RR/SR	1954-62
67-1119	Carburettor manifold stud, lower		A7SS	1954-55
67-1245	Head steady and rocker box stud	2	A Plun/Rig	1947-57

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Pre-Unit A Group

Part No

Description

Per

Models

Years