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I know this is old, but for future readers, the high speed cap is simply pulled off with a pair of needle nose pliers.

You can test pop off pressure utilizing this inexpensive tester....

Once all three carbs are sync'd, close idle stop screw to the point when the throttle plates touch the side of the carb throat, or are "fully closed". Open them just a hair so the tension of the...

The MAG and CEN appear aligned...

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Next adjust the CEN to the PTO

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All three now appear aligned.

Next, let's go through a mechanical approach to synchronizing the carbs. Some of the older intake manifolds have enough vacuum fitting to use a manometer to Sync, but most I have found do not.
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Aligned so they operate together:

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Once the screws are tightened, remove the intake manifold for adjustment of the linkages. Tighten the spring loaded screws to connect the carb linkages together.

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Adjust these...

Lay out the three completed carbs, and apply the backer plate. Install the 4 screws that hold the plate to the carb bodies loosely without tightening them. (Unfortunately the plate is upside down...

Next install the new o rings on the high and low speed adjusters. If you look closely, you will notice that there are two different sizes. The smaller o rings go on the high speed adjusters, while...

Flip the carb back over to the inlet side.

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Install new filter.

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Install gasket, now wet with oil.

Install the diaphragm and cover.

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Next install the screw which retains the lever pin. I use my left index finger to hold the assembly in place while installing the screw. Of course, I couldn't take a pic at the same time!! You get...

Before installing the new needle, I like to spray a bit of multipurpose lubricant like WD40 into the seat.

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Install the lever, pin, and needle assembly.

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When you set this...

Push the seat into place, then install the plate retainer and screw.

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Next install the new spring. Re-use the springs from a 780 sized motor.

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Install the valve body assemblies with two phillips screws.

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At this point, I open the balance of the parts from the kit and install the needle and seat. In this kit, the needles are...

Next let's install the jets and the valve body gasket.

High speed jet:

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Low speed jet:

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Pay close attention, as this valve CAN be installed backwards.

Correctly installed:

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Incorrectly installed:

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Let's start re-assembly with the Valve body assembly. Locate the new clear check valves in your kit. Be careful when opening, as they are very light and easily will disappear into your...

Now that everything is clean and prepped, I next like to layout all my parts and screws to make sure I have everything needed for reassembly. This is the time I take inventory, and decide to replace...

After the carb body is cleaned and prepped, take the valve body assembly and flip it over. There is a small phillips screw and a retaining plate. Look closely and you will see a small clear plastic...

Now that the old carb is completely disassembled, it is time to clean it. Be sure to use spray carb cleaner and compressed air to clean it out. Others prefer a full carb bath and small gauge wire...

Remove the low speed jet using the small flat head screwdriver. Find a screw driver that just fits inside the hole for the jet. Remember the jets are brass and therefore a softer metal. The larger...

Next, remove the screws holding the valve body assembly in place. Lift off the valve body assembly with pliers. You may need to wiggle it a bit due to corrosion.

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Remove the...

Here we will remove the seat retaining screw. This compresses a small plate the holds the seat firmly in place.

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With those removed, use a pair of needle nose pliers to grip and...

Next, remove the screw holding the lever arm pin. This may be corroded and tough to remove. Use lots of downward pressure when removing. You can also use an impact screwdriver to assist in removal...