It's a watercooled two-stroke twin, but with the cylinders placed in-line instead of the more conventional side-by-side. It's called 'tandem' instead of V-twin because each piston has it's own crank rather than sharing one. It uses the 'RRIS' method of disc & reed valve induction (like the AR125). There was also a KR250S with a 'KVSS' powervalve top-end. The motor was housed in an aluminium square-section frame with underslung rear shock and conventional forks with 'AVDS' anti-dive.
I got one in 2002 and struggled to find out anything about it. I started a website (KR250.ORG) to document what I discovered and I'm in touch with KR owners all over the world now. There's an owners club in Japan with their own bulletin board but there's no English-text forum... until now ! We've been given our own section on here to discuss anything to do with the original (and best
) KR. Ask questions, post pictures, advertise for parts - it's up to you !
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Gutless below 7000rpm then it really takes off. They can be difficult to start but no-one knows why. 
). Buy one if you fancy one - you won't get tired of admiring all the little details on it and it will always provoke interest from people, but think of it as a classic bike, not a nutters track weapon.
