If you wish to undertake fixes for your DF Motor DF150 4 Racing then it is usually recommended to have access to a Workshop Manual for a reference in case you need to know how to take off a particular part much like the Gearbox and install it again properly.
DF Motor DF150 4 Racing Workshop Manuals provide you with identifiable diagnostic info for your car therefore if something is not working it helps you determine what the problem is and the best way to correct it. Then you are able to decide if you can do this yourself or in case the job is just too big you can book your DF150 4 Racing in to a local car garage.
DF Motor DF150 4 Racing manual