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Aren't the cylinders also inherently unbalanced by the ignition sequence? Unlike most three- or four-cylinder engines, the sequence is uneven for a two-cylinder (not all but most commonly). I guess this has most effect on the exhaust side, so with lucky timing the gasses from cylinder 1 has just blown by when cylinder 2 valves open, helping to evacuate gasses from cylinder 2? At high revs?
Not that I can make any sense of this myself. Cylinder 2 is right? So would need more fuel? Or could have a slightly longer intake and still make same power at high revs.
Of course the opposite is also possible that at some point the gasses from cylinder 1 are just bouncing back from the exhaust when cylinder 2 valves open. At medium high revs possibly. Or on the intake that when cylinder 2 wants to take air the airbox has just been emptied by cylinder 1.
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