RE: Enya 45CX dies?
Thank you for posting this photo (#2) of the throttle valve, David.
I looked all over the web, but could not find one.
I never actually saw one, but its function hinted to me that it will look like that.
The YS metered air-bleed carburettor has a differently shaped channel/slot.
This one is kind of reminiscent of the one in Perry carburettors.