We in Australia 🇦🇺 got the Kawasaki KR250 here it was sold & raced in production racing

1994 back in Australia, one of my friend who was moving overseas sold his KR250-A to me. I never knew the history of that bike. My Japanese friend insisted I bought one of his unused Shoei helmet which in Eddie Lawson graphics. Never knew Eddie Lawson has any relation to KR-250 racing. The bike is rather quirky with overly long fuel tank, rear biased center of gravity. On a positive side it has smooth power delivery without the sudden kick when entering power band, very good rear suspension which has rebound adjustment. The original brake pads are sintered metal which is noisy and, very grabby.

Your data and dates are incorrect -Kawasaki was certainly not the first manufacturer to make an engine like this perhaps in twin format only-but the first KR250 with twin cranks one cylinder behind the other was ‘75 : Suzuki made a square four Grand Prix bike in 1967 and if you want to include four strokes Ariel made a square four in the 50s

Rotax did this before Kawasaki !!!! My friend had one in an Armstrong chassie.     !!!

A lot of your pictures has nothing to do with the subject.
Even the first one.

Where would be the advantage over a V twin

No 2 stroke  oil burners, aloud  in USA? 2 much  fun.? 750 cow?

I had a test ride on KR1S 250....it was so twitchy it was frightening....didn't buy...

All these motorcycle videos are crap .