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Somatic Negative Optimist
Join Date: Mar 2002
Location: Winlaw, BC, Canada
Posts: 7,206
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My Ox sensor is permanently disconnected.
Some people set the timing at the extreme advance-range, I don't.
I stick with the basic 5-7deg BTDC at ~900 RPM and play with the idle speed and mixture screw.
Strictly by ear: cw on the 3mm screw is richer, ccw is leaner.
I turn small ammounts cw until it coughs, then I go ccw until it coughs again. The right setting for me is inbetween. It only takes about a half-turn between richer and leaner.
Do not leave the Allen wrench in the hole when revving.
A richer setting is preferred; JW recommends 3.5% if a gas tester is used.
If you can run down to 600 RPM without too much fuss, you don't have a vacuum leak.
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1980 Carrerarized SC with SS 3.2, LSD & Extras. SOLD!
1995 seafoam-green 993 C2, LSD, Sport seats. 
Abstract Darwin Ipso Facto: "Life is evolutionary random and has no meaning as evidenced by 7 Billion paranoid talking monkeys with super-inflated egos and matching vanity worshipping illusionary Gods and Saviors ". 
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