Timing.....

Hi guys,

yesterday i tested my new timing light, working good so far. What i noticed is that when i rev it the timing is retarding first and then it will advance. Noticed this on another car, too.....can someone explain why this happens?

For me the timing should at least stay there until the advance mechanism is coming in.....should not retard in no way. Vacuum port removed of course.

Thanks for Info!

Michael