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The engine number for a BMW S1000R built between 2015 and 2018 typically starts with the letters "N5A," followed by a series of digits. For example, an engine number for a BMW S1000R built during this time might look like "N5A123456789."On the other hand, the engine number for a BMW S1000RR built between 2015 and 2018 typically starts with the letters "N5E," followed by a series of digits. For example, an engine number for a BMW S1000RR built during this time might look like "N5E123456789."