The OL had a GS400 for a training wheels bike. With careful attention to break in, oil changes and adjustments, the engines were good for about 15 - 17 Kmiles. The electric system made Lucas look like pure genius. There was a fuse that disconnected the battery from the rest of the system, and it had a shunt regulator that depended on the battery to do most of its job. If the fuse blows or the battery goes bad, the dynamo would run wild and fry everything including the special made (= hard to get) $79 headlight.
