Mid 1970's 500cc JAP with SOHC 2-Valve conversion.
Made by German tuner/rider Erich Lawrenz - the first
two letters of his forename and surname giving the ERLA.
Left is the SOHC 2-Valve engine that incorporates fuel injection.
Below is the picture of the SOHC 2-valve ERLA Longtracker.
Both the frame and engine by Erich Lawrentz.
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