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Message: [QUOTE="cujet, post: 473412, member: 19501"] Swingarm, in recent years volumetric efficiency of certain 2 strokes has actually reached the level of normally aspirated high performance 4 strokes (slightly over 100%). Of course, HP is = to torque x RPM/5252. So higher RPM and better cylinder filling/pressure result in HP. These 2 stroke engines actually do make around twice the HP of a comparable 4 stroke. The CR500 has a long stroke and therefore is mechanicaly limited in RPM. In addition port area vs. displacement is limited by simple mathematics. Ie: displacement increases faster than cylinder area and therefore port area. That is one reason why 125cc 2 strokes can make upwards of 45HP, yet a 500cc single would not make 180HP. I ride a well modified RZ350 2 stroke and can keep up with stock 600cc 4 strokes most of the time. The RZ is a very low tech 2 stroke! Chris [/QUOTE]