If you have to execute auto repairs to your Yamaha DT 400 then it is always a good plan to possess a Workshop Manual to keep just for personal reference in case that you need to know the best ways to strip off a particular component such as the Wheel Bearing and fit it again perfectly.
Yamaha DT 400 Workshop Manuals offer you precise diagnostic info on your vehicle therefore if something is faulty it will help you work out what the situation is and some ways to resolve it. Then you are able to decide if you can do this on your own or if the job is just too big you can make a booking for your DT 400 right into a local garage.
Yamaha DT 400 manual