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Old 01-21-2012, 08:49 PM   #8
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Join Date: Dec 2011
Location: Creighton Sask. Canada
Posts: 4,121
Re: Vacuum advance issues

I would pickup a carb with ported vacumn and run both this will give you your best ecomomy, but if not wanting to change carb then eliminate vac advance and just run a bit lighter spring on mech advance to get between the best of both. The vacumn doesn't work or induce advance until you are under part throttle operation and helps a bit to stop initial bog or lag off of bottom end only then mechanical advance takes over. I run a mechanical adv only with big cams and change springs till I get it where I want it. is offline   Reply With Quote