You must check the timing with the vacuum advance disconnected from the
dizzie and the pipe plugged, particularly with manifold vacuum systems, but
ported systems need it doing to if you are going to check the centrifugal
advance. You may have to temporarily adjust the idle screws to compensate.
And you are quite correct in getting the timing right - and the valve
clearances, dwell and plug gaps - before moving on to the carbs.
----- Original Message -----
From: <Menno.Meijer@ict.nl>
To: <mgs@autox.team.net>
Sent: Monday, June 03, 2002 12:09 PM
Subject: Ignition timing and vacuum advance?
> Third step: I did the second step with the vacuum advance hose
> attached. Because of the -25 deg. I've disconnected the vacuum
> advance hose. The result was that the rpm seems to drop a little
> (engine kept running) and the timing advance went to -15 deg.
>
> My question: Although I've read a couple of books (chapters)
> concerning "ignition timing" I'm not sure whether I should adjust
> the dynamic timing with the vacuum advance connected or not. If
> I should do this with the vacuum advance disconnected my timing
> might be correct.
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