I've ridden many hours on my uncle's 92 k5. First he had his stock forks changed by ?hlins, works good.
Later another stock(blue) set by
www.technical-touch.com/. One of Europe's best suspension company's.
Worked even better than the ohlins rebuild forks, and the funny thing is they made it stock how the fork
would have come from the factory in 92!!!
Now he has 48mm Pure Ohlins forks on them, and that much and much better. Real smooth and progressif built up.
Only down side the offset wheel VS steeringstem is way of!!! on high speed it's now fun.
Maybe steering demper could work??
My AF has a kxf250 frame from 2007. And would say the forks works verry well in stock condition.
My oppinion is the newer the suspension the better.
Dutch