If you want to undertake auto repairs on your own Honda SH300i then it is always recommended to have a Workshop Manual to keep just for a reference if you need to know proven methods to take out a certain component such as the Drive Shaft and install it again in the correct manner.
Honda SH300i Workshop Manuals will provide you with unique diagnostic details on your vehicle so if something is wrong it will help you ascertain what the situation is and easy methods to correct it. You will be able to decide if this can be achieved on your own or in the event the job is simply too big you could book your SH300i right into a nearby car garage.
Honda SH300i manual