I've been reading through "Back to A" and came across this comment by Carlton Palmer about Y alloy.
My bike was delivered in July 1936 and still has the original cases so Y alloy must have been in use before 1937. Perhaps most TTRs used Y alloy.
My bike was delivered in July 1936 and still has the original cases so Y alloy must have been in use before 1937. Perhaps most TTRs used Y alloy.