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You got a bike, good for you. Was it "designed" to attract people looking for lower insurance quotes in BC, Quebec and UK? Sure. That's not just my opinion.
You said that you're pulling ahead of your friend's R6 under 100km/h. Once again - your buddy has no clue what he's doing. The "street set up" you have will help you get a slight jump for 50 feet and then your buddy should be gone. Hence the joke about 10 km/h which you didn't get.
BTW, what kind of gearing do you think SV650 has? It's a low and mid torque motorcycle which is actually lighter than your Ninja.
And oh yeah, slew of differences, you're absolutely right. Different paint scheme and whatnot. Do you work for Kawasaki's marketing dep't?
It's a mechanically identical bike, save the smaller engine. A piece of plastic somewhere doesn't make a new bike. Kawasaki cheaped out. As simple as that.
You'd love the review in Cycle Canada, where they introduce the 400R as some sort of an incredible technological breakthrough without even mentioning the 650.
Must've been a nice steak dinner!
Anyhow, ANY bike is a good bike IMO. I enjoy riding 1 litre monsters but also mopeds and scooters.
However, in response to OP's original concern, I do not believe that the Ninja 400 would be suitable for her.
For $1,200 more brand new, get the Ninja 650 or the SV.
OR find them used. You can pick-up a used, 1st gen SV for $2,500 easy.