1937 bmi zk prototype, 175cc
this machine has a burman 3-speed gearbox and high level exhaust and silencer. crankcase and cylinder are integrated in one cast-iron piece, cylinder head is aluminium and there is an outside flywheel. the sidevalves are placed in front of the engine. the bmi logo is visible on the tank, the headstock and the heat protection shield over the exhaust. truly a rare and remarkable piece of dutch motorcycle history!