Mexicano said:It is a dial caliper....and yes, it works fine when the engine do not have the head installed and the engine is out of the scooter.
Mexicano said:O.K. I got it, got a dial caliper for some $34.00 Usd. at Sears and made my own adapter from an old spark plug:
http://i34.photobucket.com/albums/d101/MomoMexicano/DSC00049.jpg