I have seen a lot of posts about valve adjustment on various web sites but this is the best.
http://www.*************/rebelforum/...&highlight=zep - go there - download the video and save it for future reference.
Now - ZEP is a great guy and very good at describing how to but some of you are REAL new to mechanics.
If you are using metric feeler gages the clearance is .05 mm to .10 mm. Honda calls for .002 in. to 004 in.
Adjusting the valve clearance requires a "feel" for the "drag" on a feeler gage. If you have never done this before - - - close your mouth, don't clamp your jaws, just close your mouth, now take your feeler gage or a piece of common typewriter paper (the feeler gage is less likely to cut your lips) - place it against your closed lips and draw it through your lips. This is the approximate "drag" that you should feel on a properly adjusted valve gap.
DO NOT try to adjust your valves to the minimum gap (o.002 in) The minimum gap means that any wear or extra heat on the head can reduce your valve tappet clearance to the point that you could burn your valve seats - and that means a new head!
It is very important that your bike cool down, out of direct sunlight for at least 24 hours before you try to adjust the valve tappet clearance. If you cannot possibly let your bike set that long try adjusting your valve clearance to .003 in to .005 in to allow for the effects of residual heat in the metal parts.