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ESO 500cc Moto-Cross – 1959

Black Swan or ugly duckling – a question of perspective on this Czech scrambles machine manufactured near the Jawa factory. Eso’s were always limited production machines that ended up in the hands of the best club racers and GP riders. This helped create a mystique that lives to this day.

Taller, longer, and a little heavy compared to the British 4-strokes, the ESO was fast! The engine, the masterpiece of the ESO, was well ahead of it’s time in terms of engineering. Straight cut gears (no primary chain), unit construction, and a crankshaft that spins backwards are amongst the unique features of the ESO. The chassis measures 1” longer than the Goldstar and other popular 4-strokes and when combined with a few more degrees of rake, is a slow responder. Better find a berm!

This example is a 2-time Del-Mar Concours show winner that I’m sure you will enjoy.

Images are property of The Early Years of Motocross Museum, ®2006