The following contains an unusually high density of information for a Britbike post, so non-RGS owners may want to avert their gaze.
The attached 2-page list definitely is a rough draft, work-in-progress at this point, but it already contains more information about the differences in the configurations of the various Rocket Gold Stars than I remember seeing anywhere else. If something you'd like to see is missing (e.g. tire width), chances are high it's because it isn't in any of the bulletins from which I extracted information. Also, I haven't created a list yet for the scrambler version, but will. I'd appreciate comments from RGS owners on the usefulness, or lack thereof, of the following, and for suggestions for changes, additions, subtractions, etc.
Some important notes on what follows:
-- I used Parts Service Bulletins G.A.10 (July 1960), G.21 (April 1962) and G.21B (October 1962), BSA Inc. supplementary list (February 21, 1963), Parts Service Bulletin N.8 (August 1963), and Service Sheet 93 (February 1963) to compile the attached list.
-- I've basically used the subject headings and order from factory bulletin G.21 dated April 1962.
-- G.21 contains section for when lighting is not fitted, and another that implies it was possible to have a machine without a saddle. I've not included those sections.
-- In all cases, the bulletins from which the following are extracted are supposed to list only the parts that are different than are in the standard Super Rocket and Gold Star Spares Catalogues.
-- I've only included the "important" components in the attached list, ignoring numerous nuts, bolts, washers, cables, etc.
-- G.21B dated October 1962 says everything on the West Coast U.S.A. machines is as was listed in G.21, except for the parts listed in G.21B.
-- In principle, the parts for West Coast machines listed in factory publication N.8 dated August 1963 should be the same as those in G.21B, but there are some additional parts as well as some differences. I've used square brackets to list the parts that are in N.8.
-- Factory publication G.A.10 dated July 1960 lists the parts for the upgraded clutch fitted to all Super Rockets after frame number GA7-9483, and thus to the later Rocket Gold Stars. I've not listed those parts separately, but only refer to G.A.10.
-- Blank spaces in a column mean those items weren't listed in a particular bulletin, which typically means that item is the same as in the UK-spec machine. However, there are exceptions, such as for the front forks. There are several fork configurations on the UK list, of which only one could be possible for a West or East Coast machine.
-- Even where one of the other bulletins contains the same part number as on G.21, I've included it in the attached list rather than leaving the space blank in the column.
-- At some point BSA added three extra digits to their part numbers, which are included in G.21 but not in the other bulletins. I've kept all the digits but, for example, 18642-6376 is the same as 42-6376.
-- Although what follows shows the differences between the three versions of machine, there are discrepancies. For example, N.8 says its list is the same as "standard" RGS specifications, except for what is on the list, but it shows the same 1-5/32" carburetor for the West Coast version as is on the "standard" G.21 list. Another example is the "standard" specification has a 23T engine sprocket, but the BSA Inc. list still lists that sprocket as if it differs from "standard."
-- N.8 has 9:1 pistons for West Coast Super Rockets, and a 1-5/32" carburetor. Although N.8 doesn't have an entry for Rocket Gold Star pistons, it does show the same 1-5/32" carburetor. Even though the column for West Coast pistons is blank in what follows, it's uncertain at this point whether they are 8.75:1 or 9:1.