sentences:  The transmission was infinitely variable, however, allowing the user to simply progressively slide the rubber covered wheel from a neutral position at the center of the flywheel to a position closer to the edge of the flywheel to vary the gear ratio.The introduction of the LuLu automobile in 1914 marked a change in engineering for the vehicle.The two cycle engine was discarded in favor of the more reliable 4-stroke engine and a clutch and 3-speed transmission replaced the friction drive.