Plug Gage Sizes as they relate to Amal Main Jets
There are occasions when you what to check an Amal pilot or main jet's number against a standard.
Use these as a guide, as the final jet orifice is adjusted by hand during manufacture and checked with a manometer.
Flow in cc's     Jet Diameter
per minute          in inches

15                        -
20                        .015"
25                        -
30                        .018"
35                        -
40                        .021"
45                        -
50                        .024"
55                        -
60                        .026"
65                        -
70                        .028"
75                        -
80                        .030"
85                        -
90                        .032"
95                        -
100                    .034"
110                    .035"
120                    .037"
130                    .038"
140                    .040"
150                    .041"
160                    .043"
170                    .044"
180                    .045"
200                    .048"
220                    .050"
240                    .052"
260                    .055"
280                    .057"
300                    .059"