Hi Paul,
You where right the Revmaster is an Edelbrock carb. I can get these
for $221.00 US each. I am waiting to get a price for the postage of
these units. Its very simple to modify the float bowl. in the
modification I will make the base hold both carbs. By making the left
and right you get a great installation and only have one leaning
valve.
Regards Don
http://www.edelbrock.com/motorcycle/carbs/carb_internals.pdf


It would be too small for the rotary but maybe all right for the
six cylinder 110 HP Jabiru if you used two.
Max rating on these is about 50 HP each.

The cross sectional area is what counts. They are about 40 mm which is
1250 square mm.

A Le Mans engine runner would be about 1.875" or 48 mm in diameter.
The area would be 1800 square mm or about 50% more area and HP each carb.


Paul Lamar

Hi Don,
  I'm curious as to how you intend to lean  motorcycle carbs. Before I
committed to fuel injection, I considered m-cycle carbs and found them
all constructed basically the same. Within the throttle slide is a
needle jet that rides with the slide. In order to properly lean the
carb, say for a high elevation race, you had to raise/lower the needle
jet in respect to the slide. Since motorcycle manufacturers forsee a
owner doing this only once in a while, they provided a means  to do it
but it is not a means that is condusive to frequent change. The carbs I
investigated used E-rings an various grooves to raise/lower the needle
jet or they used washers added/subtracted under a needle jet stop .

Either case the result was to raise or lower the needle jet with respect
to the slide. I could visualize several ways of doing this externally
for one carb but when I considered several carbs and trying to
simultaneously adjust them on the fly the entire process became
extreemly complex an inaccurate. Fuel injection has its drawbacks but
the advantages seem to outweigh the drawbacks of motorcycle carbs unless
you have developed a simplified way to simultaneously lean multiple
carbs and still maintain a balanced flow.     Dave M

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