The Army who operated the M38A1 around the world never bothered with a substitute main jetting for the YS950S so I see no need for us to try now. In most cases attempting to modify jetting on any carb for higher altitude operations will result in poor performance at the lower altitudes so the normal advice is to not change jetting for altitude changes unless you intend to only operate the jeep at that new altitude.
Note that the main metering jet is variable and vacuum operated in the YS carbs. The civvy WO and YF's use a mechanical adjustable metering rod. _________________ Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100
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