1996 Johnson Evinrude "ED" 40 thru 55 2-Cylinder Service Manual, P/N 507124, Page 57Get this manual
Carburetor Orifice Plug Chart It is occasionally necessary to replace carburetor orifices to improve engine running characteristicsCheck current parts catalogs for orifice part numbers
INote Check current parts catalogs and service bulletins before making any orifice changesThe following charts list available orifices, orifice sizes, and part numbersThe identification number is stamped on most orifices10 No0 14 16 20 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 10 No0 29D 32D 34D 35D 37D 38D 39D 40D 41D 42D 43D 44D 45D 46D 47D 49D 50D 51D 52D 530 540 550 560 Part No333342 331952 333243 324005 331934 326188 328549 323003 324652 317474 322936 322776 317473 318823 320016 320015 324025 318832 323703 324698 323149 334568 327745 328535 325829 Part No338548 330142 333184 330141 333183 328537 328525 328538 328524 333182 322249 328539 328540 323280 328541 328542 324020 326526 331567 321108 321297 321407 320921 318684 Orifices (8-32 Thread Size) Size 10 No0.000 43 0.014 44 0.016 45 0.020 46 0.022 47 0.023 48 0.024 49 0.025 50 0.026 53 0.027 54 0.028 55 0.029 56 0.030 57 0.031 58 0.032 59 0.033 60 0.034 61 0.035 62 0.036 64 0.037 66 0.038 67 0.039 68 0.040 70 0.041 73 0.042 Orifices (-20 Thread SizeType) Size 10 No0.000 57D 0.029 58D 0.032 59D 0.034 60D 0.035 61D 0.037 62D 0.038 63D 0.039 64D 0.040 65D 0.041 67D 0.042 68D 0.043 69D 0.044 70D 0.045 71D 0.046 72D 0.047 73D 0.049 74D 0.050 75D 0.051 76D 0.052 77D 0.053 78D 0.054 79D 0.055 80D 0.056 81D Part No325828 325827 323151 327342 328560 326500 333741 323708 328531 334014 326928 333982 325869 328280 327739 327092 324977 326856 325837 328526 327689 327740 328562 328536 Size 0.043 0.044 0.045 0.046 0.047 0.048 0.049 0.050 0.053 0.054 0.055 0.056 0.057 0.058 0.059 0.060 0.061 0.062 0.064 0.066 0.067 0.068 0.070 0.073