The boat is powered by a 240hp EFI V6 Mercury Engine with 226 original hours. Powered by a pair of the companys 4-Tec power plants that pump out a combined 310 horsepower this 20-footer delivers the wide-open thrills usually reserved for personal watercraft --. 2007 Sea-Doo Sport Boats 150 speedster 215hp Rotax 2007 Sea-Doo Sport Boats 150 speedster 215hp Rotax We have a pre-owned Seadoo Speedster 150 with a Rotax 215 hp engine coming in soon.