The reason that you can't find a 'torque setting' for the carburettor securing nuts is probably because, to the best of my knowledge, Fiat have never issued any! I usually use a stainless-steel flat washer under a stainless-steel nyloc nut---done up firm enough to put pressure on the gasket, but not so much that the base of the carburettor becomes 'bowed'. A useful set of 'torque figures' that I was given by an engineer, to use when no torque figure is given by the manufacturer, were:---28Nm for a 8mm bolt or nut on a 8mm stud----57Nm for a 10mm bolt or nut on a 10mm stud---100Nm for a 12mm bolt or nut on a 12mm stud. Correlating from those figures, I would say that about 15Nm for a 6mm bolt or nut on a 6mm stud sounds about right.
Before you refit your carburettor, check that (a) the base of the carb IS flat, and that the 2 faces of the bakelite spacer are also both flat. If they are not, some tedious work on a absolutely flat (for example. a thick sheet of glass) suface is required using fine 'wet and dry' abrasive paper, lubricated with something like WD40.:etmeknow if you are having a problem finding the required stainless flat washers and/or stainless nyloc nuts
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