If you wish to carry out adjustments to your Yamaha DT 175 then it is always a great idea to own a Workshop Manual to use as a guide in case you want to know tips on how to remove a certain part like the Drive Shaft and fit it again perfectly.
Yamaha DT 175 Workshop Manuals are able to offer specified diagnostic guides on your car therefore if something is wrong it will help you identify what the situation is and the way to repair it. After that you can evaluate if you can do this yourself or if ever the job is simply too big it is possible to book your DT 175 in with a suitable friendly mechanic.
Yamaha DT 175 manual