Right but your talking about removing 4 cover bolts on two covers that have o-rings. Making sure the cam is on the round part and not the lobe and then sticking a feeler gage in on one valve under each cover. You could do this while you are waiting for the oil to drain during a oil change. If it needs adjustment its a bolt and screw. No cam to pull out or time.
Seriously most of the time your going to stick in the feeler gage and say yeah still good.
gavinfdavies was kind enough to send me a pdf file which shows the valve check/adjustment procedure in detail complete with photos for the MSX125. It looks easy. If an administrator wants to furnish me with an email address, I will forward it to the forum for everyone to see. Thanks again Gavin. You da man.