I didn't see any thoughts on this.  I don't know if everyone just thought it was a stupid question or if they were studiously avoiding the topic.  I mean, on a multi-cylinder engine it's less of an issue and it's virtually a non-issue as long as opposing cylinders are enlarged at the same time but I'm thinking the counterbalancer is designed with the stock displacement in mind.  While it may be that small increases in displacement won't make an appreciable difference, wouldn't it follow that the engine would become less stable the more you alter the displacement?