I want this to be in the answer somewhere:
That's a 180 hp Yamaha R1 engine. All 4 rear wheels are driven, and there is no diff. Yikes.
It had been on ebay, which is where the pictures come from, and the auction bore this important disclaimer "I DO NOT SUGGEST THAT ANYONE RIDE THIS KART"
No doy! But I'd want to anyway.
Bonus: t'was featured on Jalop back in the day:
And the Autofiends source article was penned by Jonny Lieberman: