If you choose to accomplish fixes on your own Buell Lightning CityX XB9SX then it is usually recommended to have access to a Workshop Manual for a guide if you want to know the way to remove a particular part such as the Gearbox and install it again accordingly.
Buell Lightning CityX XB9SX Workshop Manuals will give you identifiable diagnostic guidelines for your vehicle therefore if something is wrong it will help you discover what the issue is and how to fix it. After that you can determine if this can be achieved by yourself or that the job is too big you can actually book your Lightning CityX XB9SX in with a suitable friendly mechanic.
Buell Lightning CityX XB9SX manual