It's ben a long hard battle, but now the big two-strokes have virtually banished the traditional four-strokes from the 500cc class of international Moto-Cross. So how long will it be before a "Stroker" ousts the JAP and ESO engines from the top of the tree on the speedway, grass tracks and sandtracks of Europe ? Not long if a design drawn up by Olav Aaen, a young Norwegian engineer with speedway racing experience, is as successful as he thinks it will be.

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