The type 890. There are at least 6 different models of this speedwaymachine. They come with solid handlebars and with 2 piece clip ons. Later models of the 890 use the frame as oiltank. The first models have a low mounted layshaft and a straight pull chain line.
Later models are with a high mounted layshaft.
A special model 890 was exported to the USA, and on this machine is a 2 speed gearbox. A special machine is the 890.3 from 1980. Please keep this in mind. The first built iceracers are with rigid frames. In 1990 Jawa started building new types of iceracers with rear suspension as well.