If you choose to carry out fixes on your Yamaha TT R90 E then it is usually a good idea to have a Workshop Manual for a reference in the event you want to know ways to take out a particular component like the Drive Shaft and match it again safely.
Yamaha TT R90 E Workshop Manuals are able to offer unique diagnostic guides with regards to your automobile so if something is not working it can help you determine what the problem is and tips to repair it. You can then decide if this can be achieved yourself or in case the job is too big you are able to book your TT R90 E into a suitable garage.
Yamaha TT R90 E manual