2 cylinder "flicker" should be less pronounced(1/2?) than that of a single cylinder, but yes, it will still be there. Even with one power stroke per revolution, there is still a little time between power strokes for the rotating machinery to coast/decelerate. It dosn't typically show up on a meter, but you could see it with an Oscope. About the only fix for this would be to add a Automatic Voltage Regulator. This would make rapid small voltage changes and remove that pulsing you see in the lights. I use predromenantly compact Florescent lights in my home, and they don't really show the flicker on my 6/1 except where I still use incandescants. Having experimented with an AVR, I found it removes most all the flicker from a single and would probably do the same on a twin quite easilly. An AVR would smooth out the voltage, but there will always be a small frequency change, but those are not really noticiable. Even with flicker, my 6/1 powers all my electronics OK so far, and I even have 3 UPS's that it keeps on line. I can't imagine 2 cylinder flicker causing you any problems.
Ron