The 1913 Royal Enfield was a V-Twin that incorporated a unique oil lubrication system including a glass reservoir. That feature would persist for several years, until 1920. People lauded it for being easy to check that the system was working as one could see the oil circulate. This is a diagram of the system, from The Motor Cycle 1913.
Custom Bikes Of The Week: 20 August, 2017
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