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Missing air jet

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this is a 39mm fcr bought s/h believed to be from a crf 250 it has no jet where the main air jet should be is this normal for the carb as there dosent seem to be any threads to fit a jet ?? or if you have the same carb what size jet should be in there ??

th_pajandmajcrop.jpg

tech

starter jet #68

pilot #42

main #172

paj air #100

leak #70

main air unknown as missing

needle NCY 0 3d clip from top

engine side O/D 47mm

engine side I/D 39mm

intake side O/D 56mm

intake side I/D 41mm

id FCR 01BBSG27 believed from crf 250 2005 model

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Ah thats why it has no thread then , do you know what size the orifice would equate to Eddie, Im currently running a #150 main and the carb originally had a #172 so reckon there might be a bit of a difference in requirement

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