If you need to accomplish repairs to your Yamaha XT 600 K then it is usually recommended to have access to a Workshop Manual to use as a reference in the event that you need to know proven methods to take off a specific part much like the Gearbox and match it again safely.
Yamaha XT 600 K Workshop Manuals gives you precise diagnostic information for the car therefore if something is broken it can help you determine what the situation is and the best way to correct it. You can then decide if this can be done yourself or that the job is too big you can make a booking for your XT 600 K into a suitable repair garage.
Yamaha XT 600 K manual