your sideways linkage as per the above photographs.
1 Remove the #27 inside black arm attached to the barrel valve (The Scoop is
supplied this way) and keep it as a spare. This arm will be correct if you
ever use the scoop on dual
carbs, or sell the scoop to someone for this application. (If you do, this
setup is different and you will need to invert the barrel valve, buy an additional
male rod end and just join the two rod ends together to connect the barrel
shaft and the butterfly shaft to each other, then run a long link from the
bottom of the rear carburetor linkage to the inside #27 arm which will be hanging
and pushed to open the butterflies.)
Replace it with the #25 arm supplied in your sideways linkage
and set its position
close to the left photograph above, notice when the linkage is
set up correctly the top ‘rod end’ will be right up
within an 1/8" of touching the scoop body.
3 Remove the front
existing arm that pulls the throttle on your front carb off of
your existing dual carburetor sideways linkage and slide the #23
arm onto the splined shaft and just onto the unsplined area and
locate it approximately as shown in the photograph.
Connect the two arms with the ‘rod end/link’ assembly, with spacer
at the top and with the bend in the threaded rod at the bottom,
re the photograph, this linkage has a center to center length of
4 ½” (107mm) if you ever dismantle it.
5 IMPORTANT: Make
sure the top #25 arm and link connection does not straighten out
fully before reaching wide open throttle resulting in the linkage
stopping the carburetors from attaining full throttle and, excessively
pulling down on the barrel valve which could break the arms.
Once you have your linkage arms in the right positions
and the throttle fully
opening you may have to loosen the set screws on the lower dummy
barrel valve arms to position your butterflies to sit slightly ‘out’ at
the bottom at idle like a real injector does and to obtain a
wide open throttle butterfly position.