Left: 25 hp. Evinrude Big Twin Electric outboard. A standard. stalled with direct drive or reductions of 1.5:1 and 2:1. ... 25 hp. outboard and re- engineering of the Sea-Horse 10 to include intake silencers and aquot;up-and-offaquot; snap removal hood. ... 25 operates on any automotive-type, 6-volt battery, while the regular manual (pull -cord) starter remains in position for optional use. ... On display at the show was a 375 hp. unit complete with reverse-reduction gears and equipped with forward endanbsp;...