I have no idea what you are referring to.
That number means nothing by itself.
And typically the "pilot jet" is NOT adjustable......except for the "air screw" that goes along with it.
The point I was trying to make with the first post is:
Unless some modifications were made, you do NOT "adjust" your way out of a fuel mixture problem.
You need to find out what is causing the lean condition and FIX it.
The stumbling could be due to the carbs being out of sync. I would be doing a carb syncronisation before messing around with jets. Also the floats must all be to spec....any that are out will starve or overfuel the cylinder it feeds.