If you choose to accomplish maintenance to your UM GP1R 150 then it is always recommended to own a Workshop Manual to keep just for reference in case you want to know the best way to take out a certain part such as the Wheel and match it again efficiently.
UM GP1R 150 Workshop Manuals offer you certain diagnostic details for the vehicle so if something is wrong it will help you determine what the issue is and tips on how to repair it. After that you can evaluate if this can be done yourself or if the job is too big you can actually make a booking for your GP1R 150 into a decent car garage.
UM GP1R 150 manual