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Timing mark jumping around

647 views 7 replies 3 participants last post by  Conundrum 
#1 ·
Today for the first time I tried to set the timing on my 92 Miata. When I first was checking it, it was on 14 degrees, this is why I failed the smog test. It must have moved when I replaced the CAS O-ring. So after setting the timing to 10 degrees I checked the timing again and noticed that the marked was jumping around from 10 to 9/8ish and back to ten and then to 11/12ish. What would cause this?
 
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