Are we helping diagnose your banshee, or his 250r? Idgaf what other bikes are or are not doing. If you want to get YOUR bike running correctly, if it isnt already half melted down, then listen to the folks that have learned the hard way..
I'm a dumb hillbilly, but standing it up is gonna drain all fuel from carbs, causing it to start hard. Might check carbs out, make sure nothing worked it's way into jets. It's free to do, and eliminates a possibility..