Posted by Glen on 5/11/2007, 3:51 pm, in reply to "ignition timing on an '81 928 US-spec" 23 BTDC with engine revved to 3000 RPM and with hose detached. Don't worry about the exact RPM becuse the mechanical advance is maxed out by then.
4.158.222.149
Having the tech spec booklet right here...
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