This happened to me, it didnt solve the problem, but i didnt lose anymore jets. I just tied some fishing line around the jet a few times then tied it to the frame somewhere. So when you notice it running bad just check it, and if it falls out it'll be hanging on the string so all that you have to do is screw it back in.
I'm currently riding:
1984 honda110
1982 honda185s
1986 honda bigRed
1984 honda 250R-- .80 over, cobra expansion chamber, shaved head, decked cylinder, larger carb., carbon-fiber reeds, 18" carsliles, RK race chain, uni-filter.
1986 yamaha IT200
1985 yamaha XT250
1978 Italie Snark Moped
and some vintage dirtbike.