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The 2v 1100 engine has just a tad more grunt in the lower RPMs.. but the 4v engine has a HUGE kick in the pants at 5,000 rpm and better top end... It is really a choice of riding styles...
I've seen this several times over the years, but I'm not sure it is true. I have not ridden the two versions back to back, but I have ridden both and it seems to me that the 8V was more powerful everywhere in the RPM range.