1994 Johnson/Evinrude Outboards 40 thru 55 Service Manual, 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 numbersNote Check current parts catalogs and service bulletins before making any orifice changesThe following charts list available orifices, orifice sizes, and part numbersThe identification number;s stamped on most orificesOrifices (8-32 Thread Size)
10 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 290 320 340 350 370 380 390 400 410 420 430 440 450 460 470 490 500 510 520 530 54D 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
Size 10 No0.000 43 0.014 44 0.016 45 46 0.020 47 0.022 0.023 48 0.024 49 50 0.025 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 (14-20 Thread SizeType) Size 0.000 0.029 0.032 0.034 0.035 0.037 0.038 0.039 0.040 0.041 0.042 0.043 0.044 0.045 0.046 0.047 0.049 0.050 0.051 0.052 0.053 0.054 0.055 0.056