1985 OMC 65, 100 and 155 HP Models Commercial Service Manual, PN 507450-D, Page 50Get this manual
Carburetor Orifice Plug Reference Chart Orifice part numbers and size are subject to change due to atmospheric cond itions, manufacturing changes, and other conditions beyond our controlIt is occasionally desirable to replace carburetor orifices for improved running characteristicsCheck with current parts catalogs for orifice plug part numberCheck with current parts cata logs or service bulletins before making any jet changesThe following charts list available orifices and orifice size and part number identificationThe identification number is stamped on all orificesOrifices (1 4 20 Thread Size)Identification NoD Type (Single Barrel) Part NoIdentification No38C 45C 48C 49C 50C 51C 54C 56C 57C 58C 58.5C 59C 60C 61C 62C 63C 64C 65C 67C 69C 70C 76C Type (Double Barrel) Part No323150 322664 323903 322221 324906 323938 317646 325019 317021 321731 324389 317330 321449 320661 317607 321559 324776 322810 317183 319776 322996 317488 320502
Size 0.038 0.042 0.045 0.048 0.049 0.050 0.051 0.052 0.054 0.055 0.056 0.057 0.058 0.0585 0.059 0.060 0.061 0.062 0.063 0.064 0.065 0.067 0.069 0.070 0.072 0.076 0.Q78 Orifice Plugs (51624 Thread Size)