| I understand the L (90 degree) twin has excellentprimary and secondry balance forces that do not need balance shafts that rob power to smooth out the engines vibrations, I think this was well demonstrated with the Supermono where dispite a CC shortage against some of its rivals it was still the quicker bike, yes I know it wasn't actually a twin but the dummy rod setup where the rear cylinder would be certainly gave it certain twin characteristics where as the bigger cc singles had to give up power to balancing systems. | 
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