If you wish to carry out maintenance tasks for your Yamaha TR 1 then it will always be recommended to have access to a Workshop Manual for a guide if perhaps you need to know how you can take out a certain part for example the Clutch and install it again the right way.
Yamaha TR 1 Workshop Manuals gives you certain diagnostic facts on your car or truck so if something is not working it can help you ascertain what the issue is and the way to resolve it. You can then evaluate if this can be done by yourself or that the job is too big you could book your TR 1 in with a nearby mechanic.
Yamaha TR 1 manual