Retro 2-stroke: Riding a 1990 Kawasaki KX250 and why it makes sense Bikes - May 23, 2019May 23, 2019 Some say it was the golden era of motocross. We ride a 1990 Kawasaki KX250 2-stroke to see what all the fuss is about. Crank up the volume and listen to that sweet sound!