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what exatly does vacuum advance do
Set my timing on my 83 SC RoW yesterday and used my vacuum gauge to plug distributor vacuum line while I was setting it per manual. Noticed that the only time I saw a vacuum signal was when I blipped the throttle. Does this seam right? So I am guessing that the port for this line is located on the airbox side of the throttle plate. A little theory would be good if someone could enlighten me.
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Lorraine 83 SC CAB RoW
2003 C4S coupe
07 BMW R1200RT
76 BMW R90S
76 BMW R60/6
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