RacerManiac

Does anyone know how to modify .smali files and change them to update a specific object's attributes like speed, rotation speed etc.? I need some guidance for my remake of a game called Bike Race but I can't tell from which number based stat is the Bike's speed and other attributes from it's object ID and other number-based attributes? Thx! (it is legal and approved if you may ask, because the developers say the establishment of mods doesnt ruin their revenue, they own plenty of games.)