Cheat Method
     Go to the Data\ levels \barcelon\Script\level.ini

change number of NbMaxMotos=12 to 1 then,
change number of GainSR_0_0_0=10 to 100 (for ex.)
save.... 

     This way you will be the only one in the race and win every time.
You will also gain credits.

Custom Soundtrack (submitted by Mike):
     To  listen  to your fav. songs while ridin' your fav. bikes go to
:\\Data\\Sounds\\#GameMusic and delete all the songs except for one or
two, then add all your fav. songs!