Chain saw, huh? I have an OCD thing with mine too - gotta prime the choker EXACTLY 7 times, put the goggles down over my eyes, pull the starter, rev it exactly 3 times, and off I go.
Word of wisdom: Never lick a chain saw. Ever. A hint - good things rarely come from it, and people look at you funny.
But if you insist, what you do in the privacy of your own home is your business.