Great to hear of another survivor. The Gold Star Owners Club has only 105 early (one piece head) ZB34 GS machines declared and another 17 later (separate rockerbox) ZB 34 GS machines declared by their members.
Well, maybe since the end of may 106? Dependening how old Your βdataβ is/was ;-) or if you are counting engines or frameβs...
I have bought in may 2019 an ZB34 GS engine, found in a shed in the USA (not by me, so no further history available) it was fitted in an cb32 swingarm frame, covered in mud, used as a scrambler or maybe flattrack .....
Since the frame is used to build a big-fin goldie, the engine came up for sale...
According Ian Jackson ; quoteβ ZB34 GS 148 was despatched with a ZB32S 200-sequence frame to Rich Child Cycle Co, New York [the East Coast BSA Distributor] on 10 May 1949β unquote.
There seems no dyno sheet available at the goldstar ownersclub UK, but it had a first generation clubman head fitted when found, 9:1 hepolite piston, etc. And a pair of 65-2438 and 65-2436 cams..
I had it relined, because of a smal crack in the cilinder, by Phil Pearson. And am now in the proces of building up the engine again, to be fitted in a B31 frame for the time being and drive it to the international BSA rally in the Cotswolds UK this year
After the summer, i have planned to build a sort of ISDT replica, like the β52 works ISDT swingarm (although they used a BB engine ofcourse)
Without the correct frame it will never be original again, so a good reason to build what i like ;-)