Balancing specifically at fast idle isn't really necessary as that is only
used when warming up. But checking they are balanced off-idle by opening
the throttle a little and readjusting the synchronising tool *is* essential,
for obvious reasons. Fast idle opens the butterflies differently to the
throttle cable.
There should be about 1/2" of choke cable movement giving a fast-idle speed
of about 1100-1200 rpm with a *warm* engine before the jets start to move.
You can't see the enrichment valve on an HIF of course, but there should be
arrows on the fast idle cams that when positioned under the fast-idle screws
indicate that enrichment is just about to start. You are supposed to set
the fast-idle revs there, but on my V8 at least that gives far too high an
idle when there is enrichment as well so I have them adjusted by ear rather
than revs and arrows.
PaulH.
----- Original Message -----
> I've gotten into the habit of synching not just the idle but the fast idle
> as well.
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