Rare Czechoslovakian four-stroke motocrosser,c.1959 ESO  500 Frame no. 1625 Engine no. 500325/196

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Lot 197
Rare Czechoslovakian four-stroke motocrosser
c.1959 ESO 500

Frame no. 1625
Engine no. 500325/196

US$ 18,000 - 20,000
£ 13,000 - 14,000
Rare Czechoslovakian four-stroke motocrosser
c.1959 ESO 500

Frame no. 1625
Engine no. 500325/196

Thank speedway racing for giving us the grand ESO scrambler, Czechoslovakia's contribution to four-stroke motocross history. Following World War II, speedway competition was wildly popular across Europe, including with the Czechs, many of whom who used old British J.A.P singles in their racebikes. Spare parts being in short supply, mechanically talented Jaroslav Simandl undertook construction of several vital components for himself and his racing buddies, then in 1949 decided he could just as easily improve on the prewar J.A.P. motor with a design of his own. The resulting dry-sump, semi unit-construction engines were made in 250, 350 and 500cc versions, used not only in speedway and roadracing, but also to good effect in the new sport of motocross. The bikes were called ESOs, Czech for "Ace."

While complete scramblers were given to promising up-and-coming club racers and Czech experts, the ESO engine's greatest glory came when the powerful single was placed in Swede Sten Lundin's Lito frame and he went on to notch the 1961 world motocross championship. Fellow Swede Bill Nilsson also had good showings on his Rickman-framed ESO-Metisse, including a win at the 1964 German GP. That same year ESO was acquired by the Jawa-CZ conglomerate, which folded the nameplate to concentrate on its successful line of two-stroke motocross bikes, though ESO lived on in the company's speedway engine, now branded as Jawa, still being used in competition today.

The Mork collection's ESO 500 scrambler is an original, low-miles example, virtually complete, with its engine in running condition, having benefitted from a recent clutch rebuild. Also present is the rare stock carburetor, a 35mm Dell'Orto SSI. Some restoration work has already been carried out, awaiting a new owner to take this important machine to the next level.

Footnotes

  • Offered on a Bill of Sale.
Contacts
Rare Czechoslovakian four-stroke motocrosser,c.1959 ESO  500 Frame no. 1625 Engine no. 500325/196
Rare Czechoslovakian four-stroke motocrosser,c.1959 ESO  500 Frame no. 1625 Engine no. 500325/196
Rare Czechoslovakian four-stroke motocrosser,c.1959 ESO  500 Frame no. 1625 Engine no. 500325/196
Rare Czechoslovakian four-stroke motocrosser,c.1959 ESO  500 Frame no. 1625 Engine no. 500325/196
Rare Czechoslovakian four-stroke motocrosser,c.1959 ESO  500 Frame no. 1625 Engine no. 500325/196
Rare Czechoslovakian four-stroke motocrosser,c.1959 ESO  500 Frame no. 1625 Engine no. 500325/196
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