No Reserve: 1957 Zundapp KS601 EL

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This Zundapp motorcycle appears to be a 1957 KS601 “Elastic” model with a 597cc boxer twin and 4-speed transmission. Built in post-war Germany, the relatively powerful engine and heavy-duty construction made these bikes well-suited to endurance or sidecar duty. Approximately 5,000 were produced including the US-only Elastic model, which was updated with more power and a different rear frame design to accommodate a revised rear suspension. Just 200 Elastics were reportedly built during late KS601 production, and this example has spent eight years in the seller’s Indiana collection. Basic KS601 models were typically finished in a pale green which leant the series its “Green Elephant” moniker. The Elastic model could be had in a number of colors, and the original hue of this example remains unconfirmed. Current black paint is shown up close in a number of photos below along with brightwork, badging, and a small tear in the right knee pad. A more modern two-place seat has replaced the bulky factory single-piece item, and a handful of trim pieces are missing. The taillight, rear shocks, and exhaust system also appear to be aftermarket replacements. Tires, brakes, and cables are all said to remain in good condition and all accessories function properly according to the seller. Just under 17k miles are shown on the 5-digit odometer. The 597cc boxer-twin produced 34 horsepower in Elastic trim. Fuel petcocks and 25mm Bing carburetors have recently been cleaned, and the fuel tank looks good inside according to the seller. General maintenance has been carried out by the collection’s mechanic over the past eight years. A 4-speed duplex chain driven transmission sends power to the rear wheel via a driveshaft rather than a chain. Suspension consists of a telescopic fork up front, while the Elastic model got a swing-arm setup to replace the plunger-style rear end of the basic KS601. Both wheels are equipped with drum brakes. The collection is managed under a dealer license and the sale includes a clean Arkansas title for reassignment to the new owner. The motorcycle is listed as a 1951 KS601 on the title, though its frame number 555255 appears to identify it as a 1957 KS601 EL.

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