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From: Mark Olson on 18 Mar 2010 22:43
paul c wrote:

> Friend's CB750 is long gone, air cutoff on all four makes sense, just
> trying to remember why the accelerator pump (which I think was what was
> pictured) was only on one carb. Mark?

I imagine it was plumbed somehow into all four carbs, I remember wondering
about it at the time I owned it, but as it worked fine I had no reason to
question it.
From: ` on 19 Mar 2010 08:46
On Mar 18, 5:35 pm, paul c <toledobythe...(a)oohay.ac> wrote:

> Friend's CB750 is long gone, air cutoff on all four makes sense, just
> trying to remember why the accelerator pump (which I think was what was
> pictured) was only on one carb.

One pump is plenty to meet the requirement for extra fuel during low
vacuum conditions.

If you study the carburetor drawings, you'll see that there are rubber
tubes connecting all four carbs together. The accelerator pump output
goes to those tubes so all four carbs get a squirt of fuel when the
throttle is opened but engine vacuum is too low to suck fuel through
the idle ports and the needle jet.
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