Hi, every one.
I just want to share this as this could help so much newbie modder like me :
http://forum.mx-bikes.com/index.php?PHPSESSID=711f0db052c19b9f247dc147d43da909&topic=1546.0
This is for Mx bikes, so oriented in dirt bike, but can be adapted to gp bikes, at least explain you how bike ed and enged work (wich is pretty difficult due to lack of online ressource to learn it)
Hope you enjoy ! :)