Speedway Workshop

The Eso - Joli

Josef Linhart made the JOLI between 1947 - 1950, the name being derived from the first two letters of his first name and his surname. You will note (left) that it was in fact a replica of the JAP engines of that period.

From 1950, Jaroslav Simandl bought up all the remaining spares of the by now defunct JOLI engines and used them to produce his own version - the ESO (see below).
The JOLI engines were fitted with a Bronze cylinder head and used five holding down bolts, whilst the early ESO's came in three variety's:
1. With Bronze head and five holding bolts.
2. With Bronze head and four holding bolts.
3. With cast iron head and four holding bolts.

NOTE: At the foot of this page you can see a timeline of the ESO Production years, that was kindly sent in by Andrew Cooper

Seen Right is one of the later versions of the early ESO engines. Still built from JOLI parts, this engine used a cast iron head and four holding down bolts.

ESO of course went on to develop more modern engines, before finally being bought up by the JAWA company. The ESO company made Speedway and Grasstrack machines using 500cc and 350cc models and weighed in at 182lbs.

A lovingly restored ESO/JOLI (Above) owned by Roy Young, this particular machine is of the 5-Stud Bronze Head type. The pictures below are of Ian Paterson's excellently restored 1951 ESO, and clearly shows the extra adjusters on the clip-on style of handlebars.

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ESO Production 1948 - 1964.

1949-1953 Production of tools, ingot moulds, presses etc. Speedway Engines "S" - small series.
1951-1957 Production of prototype for Road Racing Motorcycles.
1953-1954 Production of prototype Speedway Motorcycles "ESO" S-45
1953-1954 Scooter "ESO" 100 Production.
1953-1956 Carburetters "ESO" 30mm - 40mm.
1954-1956 Four Valve Racing Engine.
1954-1955 Spare parts for Road Race motorcycles Walters
1954-1962 Production Motocross Motorcycle "ESO" MC350
1954-1958 Formula 3 Race Car "ESO" F3
1955-1958 Production of Speedway Motorcycle "ESO" S-45
1955-1962 Production Motocross Motorcycle "ESO" MC500
1955-1962 Production Motocross Motorcycle "ESO" MC250
1955-1958 Prototypes of Road Race Motorcycles "ESO" 350 and 500 with OHC engines
1959-1965 Production of Speedway Motorcycle "ESO" DT-5
1959-1962 Prototype of Longtrack motorcycle.
1960-1962 Prototype of Motocross motorcycle "ESO" MC250 with desmodromic engine.
1962 Prototype of Motocross motorcycle with Longstroke Engine.
1963-1965 Production of Motocross motorcycle "ESO" MC500 with Long stroke engine.
1964-1965 Prototype of Ice Racing speedway motorcycle. 

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