Broken!!!
 

I just made a copy of Dave Mira BMXin. I pt it in the dreamcast and turn it on.Game loads up fine except the screens jumpin and theres like five of the b*stards!please help!!!

Sounds like you have the NTSC version released by Echelon and your trying to play it on a PAL TV that doesn't support a 60Hz refresh rate. Buy a new TV and that should cure it ! or a considerably cheaper option is available at www.lik-sang.com, it's called a DC PAL Booster which will convert a 60Hz signal to a 50Hz one which should cure your problem. Though I'd try the game on a TV that does support 60Hz first, just to be sure that's the problem.

Better yet , get a patch, they are extremly free... its pretty simple, once applied to the iso, at the start of the game it asks you what version u wanna play: ntsc or pal