On a 13 Guzzi Stone. I don't think the con rods share a bearing, so they must be positioned side by side. So one cylinder must be slightly in front of the other. OK, so which cylinder is positioned closest to the front wheel? I can't eyeball it.
Is this arrangement true for all Guzzis throughout history, or does it vary somehow?
Seemed like this was more obvious on my BMW airhead. Or maybe I'm just going blind.
As has already been stated, the rider's right cylinder is offset further forward.
Yes, this is more obvious on the BMW boxer engines.
The BMW crankshaft has 180 degree staggered crankpins for the connecting rods. The Guzzi crankshaft has a single pin onto which both connecting rods fit, side by side. The separate crankpins on the BMW crankshaft position the connecting rods further apart (and the cylinders) than does the single pin crankshaft of the Guzzi.
Getting more technical, the BMW arrangement creates more "rocking coupling" imbalance than does the Guzzi. If Guzzi had knife-and-fork connecting rods like the Harley Big Twin, the rocking coupling effect would be eliminated and the cylinders would not be offset.