let's see, I explain ... since 1981 honda took out the "dax 90" and its design was the first to bring axial floating valve system, which does not have a regulation register of any size, (it is axial play) means that only the (free movement to the sides) is the right light.This was transmitted by copy to each motor of the same type (they are not regulated with a probe).
to regulate them:
the psiton is put in PMS, and the nuts of the regules are loosened (usually, the admicion is always closed, due to wear, and exhaust is open, by the carbon.