If you want to execute maintenance tasks to your Honda SH300i then it will always be a great idea to own a Workshop Manual to keep just for reference should you need to know techniques to take off a specific part for example Brake Discs and install it again appropriately.
Honda SH300i Workshop Manuals provide you with targeted diagnostic guides on your vehicle therefore if something is faulty it helps you figure out what the situation is and how to correct it. You can then decide if you can do this yourself or if ever the job is too big you are able to make a booking for your SH300i right into a decent garage.
Honda SH300i manual