Re: bmx w/Yamaha 100
What seems like a small hop turns into a big annoying bump at speed. Loosen all the spokes, and start over, snug down 3 at the valve stem, rotate the wheel 180, snug three more, rotate 90°, snug three,180, snug three, then snug down the rest. If there's still a hop, start tightening them where the high point is.
Spokes should all be even more or less in the nipples.
Once they're all semi tight, true it side to side. Etc...