Harley-Davidson Flathead DS30

The 1930 Harley-Davidson 30-DS belongs to the early 45-cubic-inch D series that introduced Harley's long-running side-valve V-twin. Intended for sidecar duty, the DS combines a 742cc flathead with a three-speed gearbox, hand shift and foot clutch. This is not a motorcycle to judge by shine alone: numbering, crankcases, frame, fork, carburettor, ignition and sidecar fittings determine authenticity and value. Have engine and frame numbers assessed by a marque specialist and inspect restoration records. Start it from cold, listen for connecting-rod and valve-train noise, and watch for oil smoke, crankcase leaks and poor fuel delivery. Check play in wheel, steering-head and sidecar bearings, brake operation, rims and spokes. Original components are scarce and reproduction quality varies. A properly set-up DS is modest in performance, deeply mechanical and highly distinctive, but it requires specialist maintenance and realistic expectations of braking and cruising speed.