I don't think you'll have a problem. There's something like a 'good faith' agreement between the various states. And among various nations, too, for that matter.
In effect it means that if a vehicle is legal in it's home state, then it's considered to be legal in the state it's visiting.
There are bound to be exceptions. And something like motorized bicycles, a pretty gray area, might definitely include these exceptions.
But if you're not riding in a place where they are definitely illegal, Washington would be the only state that I know of, then law enforcement is not likely to care a whole lot about you riding on their turf.
This ain't much of an answer I'm giving you. It boils down to 'you're probably okay, but maybe not'.
But you're probably okay.