Not sure what the GP is. But the 650 displacement Kawi that I'm aware of has a twin cylinder, inline engine. The 600's have a 4 cylinder, inline engine.
Typically, more cylinders for a given displacement results in higher rpm and peak horsepower. This is for various mechanical reasons. Fewer cylinders for the same diplacement results in lower peak power but higher low end torque (and overall smaller engine weight, all else equal).
A V configuration typically results in higher torque than a similar inline engine, but greater weight and vibration.
Today's inline 4's are the kings of street bike power/weight ratio.
Large bore twins are the torque kings.
Small displacement inline twins are a compromise for good fuel economy, reasonable power, and light weight, while maintaining enough torque off the line. They are not gonna give you significanly more low end torque than the 600's in that package, but will cost less and save you a lot of money on insurance. They might even increase your lifespan.
But they won't make you grin the same way as a 600 inline 4 when it hits its powerband.
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