The (old) 650, new 700, and the 800's all used the same 800cc engine. BMW "detuned" (lowered HP and torque) the 650 and 700 by (I think) using different cams and CPUs. They were called 650cc and 700cc but were actually 800cc. Very confusing.
Actually, I believe it is a very good attempt to sell lesser powered motorbikes to the world market, and in reality, do most newer riders care more what the motorbike is called/engine size?
.......or they care more that it is lesser powered (safe for a newer rider), and costs less at the same time?
THINK ABOUT THIS:
When we here in the states always used cubic inches to describe power and speed of motorbikes way back when, the Brits and the Japanese came on to our shores with cc's!
.....we resisted, and even HD still resists!
And even when automobiles AND trucks in the USA described engines in Cubic Inches, models from overseas came in CC's....we resisted
Wrenches and nuts and bolts in the USA were always inches......metric most other places in the world.
AND NOW......? HD resists still, but most everything else newer made is metric.
Call it hp, call it torque, call it cc's for engines, but in reality, it is only a measuring stick.
AND most of us here know that a 650 usually has less power than an 800, most of the time.
So, what is so confusing?
Hey, just an old man's opinion