Remove valve cover, remove the pushrods for the cylinders that you want to disable. You want the valves to remain closed. Why? If the intake valve opens, it will suck fuel - if the exhaust valve opens it will pull in heat, soot, and possibly dirt from the exhaust.
Remove the spark plugs, make a pipe to go from the holes to some sort of air filter so you don't suck dirt in. Now those two cylinders won't be consuming fuel and won't require power to push over compression. Just a bit of friction loss. Of course the carb will now need adjustment...
All of the above is easy to reverse and doesn't require much disassembly. I don't know if two cylinders will pull hard enough to get your RPM up where you need, though.
If you go ahead with removing the pistons, be sure the valves are disabled and closed. My recommendation is to come up with weights that are equal to the piston and rod to hang on the crankshaft journals - just like they do to balance a crankshaft. This way you can put the bearings in and don't have to worry about plugging any holes.
Just my thoughts... I've driven the A around on two and three cylinders before just to see how it sounds, it runs OK but the power is a bit more "rough."
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