Yep - if we employ two balance shafts per crankshaft, or the Husaberg-solution with balance weights
on the crankshaft.
In our usual layouts there is a definite distance between crankshaft and balance shaft. This distance between a crank force acting in one direction and a balance force acting in the opposite direction causes a fore-aft rocking torque.
The balance shaft solution as used in the Aprilia RSA for example, with outrigger balance masses, allows the smallest distance between crankshaft and balance shaft center lines.
In the Husaberg approach this distance is zero, which in itself is perfect. But if you want to do this right, you'll need balance discs on
both sides of the crankshaft
and both these discs must rotate counter-crankshaft-wise, which will require a handful of gears.
Attachment 342597 Attachment 342598
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