The FH kit arrived all those years ago with a brand new Amal Mk1 Concentric, a 928 and a carburetter that I have no experience with whatever, but I am not going to delve into that now. Today I am only concerned with mounting it to the head.
The standard carburetter for the FH is a Monobloc, retained with two 3/4" hexagon bolts with 5/16" CEI threads. All well and good, but the concentric has a rather large tickler button which prevents you getting the bolts in...
No matter, I can make a couple of studs on the lathe. These will be 5/16" CEI both ends, about 1 1/16" long with about 3/16" plain in the middle. Here they are, part way through manufacture:
I bought a new alloy bell mouth, which is very nice. The rubber fits neatly inside it:
The next problem is that either the carb thread or the bell mouth thread is not to size, or is damaged. This is as far as it will screw on:
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