The Mariner Boat Starter Designed for starting all belt-start larger boat engines, this starter features a steel handle, steel end plates and a stepped aluminum drive pulley. The starter can be operated on 12V or 24V, maximum 100 amps. Output is 600 in-oz (424 N-cm) at 12V, 1200 (848 N-cm) at 24V. 2800 no load RPM at 12V, 5600 no load RPM at 24V. For most belt start marine engines. No. S650.