hi,
is there a mod with a rally / dakar bike?
No, not for the moment, but i think that if you really want it, you can do it by yourself, everything you need to do is take a bike model and add some particulars to make it seem like a real dakar bike.
if I were supplied the Bike Model id be willing to make you some bits and ends to make it more Dakar.
It would be a fun Project so I wouldn't want to be rushed...
Thanks
-Mop-