[T2] Timing a 2 liter Bus engine with a 009 and aftermarket carb

[Tim Shepherd]

Greetings all, trying to time a 1973 Bus with a later 2000cc engine, 009 distributor and aftermarket carb. Do I time it to when the white mark is at 9 degree mark at the top of the gauge After Top Dead Center as per the manual, or to 7.5 degrees as per Muir, or...?