have you tried Dirt Bike. It's a motorcycle motorcross game and a hell of a laugh. Best of all it's free.
"Dirt Bike is a motorcycle simulation action game. Using complex physics, it very accurately simulates a Dirt Bike being ridden over various terrain. You design the bike and control the throttle, shifting and steering to race against other players, computer controlled bikes, and previous high scores. Registered users can create tracks of any shape including huge jumps, hill climbs, motocross, trials courses, or anything else you can imagine. Motocross riders love this game for it's riding realism."
elasto mainia was a kool game back in the day, not all dat long ago i downloaded a northshore freeride game of nsmb.com, it was fun for a bit then it got deleted but you should have a look on dat web site sometimes they have games on there kool 1z az well