I remember playing this game when we exchanged memory cards, I don't think I ever X-Ported this code though, it's a pity as it would have saved you a lot of typing.
The game seriously rules though and was one of the most impressive things that was ever made with Yabasic.
What amazed me the most were the race cars, I couldn't believe how you had made the models look so good with only a few simple shapes.