This chart includes what we know about the original size and part
numbers for the Carter AFB carburetor jets and step up rod (metering
rod). Keep in mind that these specifications were written when gasoline
was much different than it is today. Use only as a guideline. It’s all
about trial & error these days. Since it now takes more gas to go
the same mile, fudge to the bigger size jets and smaller size metering
rods.
Carburetor Number Primary Jet Carter # Pri Secondary Jet Carter # Sec Metering Rod Size (cruise x power)
2441S, SA .0935 120-166 .0635 120-176 16-14 .0725 x .063
2448S .089 120-159 .0649 120-226 16-35 .0645 x .058
2507S .0935 120-166 .0748 120-229 16-25 .066 x .054
2686S .089 120-159 .061 120-186 16-35 .0645 x .058
2790S .089 120-159 .055 120-174 16-40
2791S .089 120-159 .055 120-174 16-26
2903S .089 120-159 .0595 120-196 16-119
3123SA .0935 120-166 .0785 120-194 16-169
3247S .089 120-252 .057 120-193 16-160
3249S .089 120-252 .057 120-193 16-165
3251S .089 120-252 .065 120-226 16-160
3252S .089 120-252 .065 120-226 16-162
3253S .089 120-252 .0635 120-176 16-161
3256S .089 120-252 .065 120-226 16-160
3257S .089 120-252 .065 120-226 16-159
3258S .099 120-159 .067 120-185 16-81
3259S .099 120-159 .055 120-174 16-192
3270S .1015 120-162 .086 120-165 16-193
3297S .092 120-256 .082 120-158 16-167
3300SA .0935 120-166 .0785 120-194 16-126
3326SA .0935 120-166 .0785 120-194 16-126
3351S .098 120-163 .082 120-158 16-197
3352S .098 120-163 .082 120-158 16-197
3374S .089 120-252 .0689 120-228 16-157
3375S .089 120-252 .0689 120-228 16-157
3437S .089 120-194 .0689 120-228 16-217
3437SB .089 120-252 .0689 120-228 16-217
3447S .098 120-163 .082 120-158 16-51
3447SA .098 120-163 .082 120-158 16-51
3460S .104 120-161 .0635 120-176 16-204
3461S .104 120-161 .070 120-222 16-205
3477S .0935 120-166 .081 120-233 16-260
3478S .089 120-252 .0689 120-228 16-217
3478SA .089 120-252 .0689 120-252 16-217
3479S .0935 120-166 .076 120-177 16-122
3480S .098 120-163 .082 120-158 16-226
3481S .098 120-163 .082 120-158 16-226
3499S .1015 120-162 .0846 120-257 16-202
3502S .935 120-166 .0785 120-194 16-260
3503S .092 120-256 .082 120-158 16-219
3503SA .092 120-256 .082 120-158 16-219
3505S .089 120-159 .082 120-158 16-118
3505SA .089 120-159 .082 120-158 16-118
3506S .089 120-159 .076 120-177 16-99
3507S .1015 120-162 .089 120-159 16-263
3521S .0945 120-164 .086 120-165 16-225
3522S .0945 120-164 .086 120-165 16-225
3540S .089 120-159 .057 120-193 16-240S
3545S .0935 120-166 16-126
3545SA .091 120-155 .081 120-233 16-126
3559S .1015 120-162 .098 120-163 16-211
3574S .0935 120-166 .076 120-177 16-122
3578S .092 120-256 .089 120-159 16-232
3579S .092 120-256 .086 120-165 16-250
3588S .1015 120-162 .089 120-159 16-263
3589S .089 120-159 .076 120-177 16-99
3589SA .089 120-159 .076 120-159 16-99
4430S 16-341 .0685 x .059
4431S 16-543 .069 x .054
4432S 16-543 .069 x .054
4611S, SA .089 120-489 .095 120-395 16-581 .065 x .063 x .055
4612S, SA .089 120-489 .098 120-398 16-160 .0645 x .062 x .055
4615S, SA .089 120-489 .092 120-392 16-164 .065 x .060 x .053
4616S, SA .092 120-392 .092 120-398 16-574 .065 x .060 x .053
4617S, SA .101 120-501 .095 120-395 16-176 .067 x .065 x .055
4618S, SA .101 120-501 .095 120-395 16-575 .065 x .062 x .053
4619S 16-82x .068 x .061
4620S 16-543 .069 x .054
4621S 16-543 .069 x .054
4638S, SA .089 120-489 .089 120-489 16-574 .065 x .060 x .053
4639S, SA .089 120-489 .098 120-398 16-160 .0645 x .062 x .055
4640S, SA .101 120-501 .095 120-395 16-575 .065 x .062 x .053
4660S .089 120-489 .080 120-380 16-584 .072 x .070 x .064
4661S .098 120-498 .080 120-380
4662S .089 120-489 .080 120-380 16-587 .065 x .063 x .058
4663S .098 120-498 .080 120-380 16-585 .077 x .073 x .068
4664S .089 120-489 .080 120-380 16-575 .066 x .062 x .053
4665S .098 120-498 .080 120-380 16-552 .0774 x .073 x .064
4682S, SA .089 120-489 .092 120-392 16-165 .0635 x .060 x .053
4695S .095 120-395 .074 120-374 16-583 .051 x .048
4711S, SA .089 120-489 .092 120-392 16-160 .0645 x .062 x .055

Step Up Rod Sizes (metering rods)

16-14 .0725 x .063
16-21 .0725 x .066
16-22 .07375 x .068
16-25 .066 x .054
16-26 .0675 x .056
16-28 .071 x .0635
16-29 .06475 x .052
16-39 .066 x .061
16-40 .0675 x .064
16-82x .068 .061
16-341 .0685 .059
16-402 .072 .065
16-428 .072 .065
16-432 .074 .065
16-543 .069 x .054
16-552 .0774 .073 .064
16-575 .066 .062 .053