How do you adjust suzuki GN125 valve clearance?

Q: What are the clearances of inlet and exhaust valves of Suzuki GN 125, and how to adjust the valve clearance.

A: I'm giving an approximate answer since none is given here. I've just started doing this and don't know all the terminology. Please improve the answer if possible. :)

You have to open the two caps hiding the valves on top. They are size 17. Also open the little bolt in front so you can look inside the motor for the "dead point" while rotating the motor manually. The adjustment is done with a flat screwdriver and the clearance should be between 0.08-0.13mmon both inlet and exaust. You have to use thos flat metal thingies to measure the clearance.