Auto-advance adjust how millimeters ?

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Hello,

How many millimeters before the BTDC is it necessary adjust the auto-advance ? 7 ? 8 ?
Thanks
 
With contacts breather points it is 6.678 mm then.
Thanks you very much L.A.B ;)

31°= 0.320" (8.127mm) BTDC (Before Top Dead Center), 30°= .300" (7.63mm) BTDC, 29°= .281" (7.147mm) BTDC, 28°= .263" (6.678mm) BTDC, 27°= .245" (6.224mm) BTDC, 26°= .228" (5.784mm) BTDC, 25°= .211" (5.359mm) BTDC, 24°= .195" (4.949mm) BTDC, 23°= .179" (4.554mm) BTDC, 22°= .164" (4.174mm) BTDC, 21°= .150" (3.81mm) BTDC, 20°= .136" (3.462mm) BTDC.
 
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