This was our $150 Ninja when we got it -
It did run (amazingly), but the gas looked like dirty water and the oil looked and smelled like dirty gas.
After completely going through it, changing everything and installing new tires, my son rode it for a few years and about 6000 mi - most of that over 10,000 RPMs. It ran really well considering it had pod filters and a leaky exhaust.
I would say this is the type of thing you want if you were to go the cafe route with a Ninja.
Your yellow one just looks too nice to dismantle.