If you want to perform maintenance on your own Kawasaki KX250 then it is always a good plan to possess a Workshop Manual to use as reference if you want to know the way to take out a specific part for example Gearbox and fit it again in the correct way.
Kawasaki KX250 Workshop Manuals gives you precise diagnostic information for your vehicle therefore if something is broken it can help you determine what the situation is and ways to correct it. After that you can assess if this can be achieved by yourself or that the job is just too big it is possible to make a booking for your KX250 in with a local mechanic.
Kawasaki KX250 manual