If you have to conduct maintenance tasks on your Honda SH 150 then it is always a good plan to have access to a Workshop Manual to keep just for reference if perhaps you need to know the right way to take off a specific component for example, the Wheel Bearing and install it again effectively.
Honda SH 150 Workshop Manuals will give specific diagnostic details on your vehicle therefore if something is faulty it helps you discover what the issue is and how to resolve it. You can then evaluate if this can be done on your own or that the job is simply too big you can make a reservation for your SH 150 in to a trusted garage.
Honda SH 150 manual