If you want to execute adjustments to your Kawasaki KLX140L then it is always a great idea to have access to a Workshop Manual to use as a guide in case you need to know simple methods to remove a certain component such as the Exhaust and match it again properly.
Kawasaki KLX140L Workshop Manuals offers clear certain diagnostic guides for the car therefore if something is wrong it can help you work out what the issue is and methods to correct it. You will be able to evaluate if this can be done by yourself or if ever the job is simply too big you could book your KLX140L into a decent mechanic.
Kawasaki KLX140L manual