Tips & Advice What Is The Highest Horsepower Jet Ski? November 4, 2002 The highest horsepower jet ski is the Kawasaki Ultra 310 series, with the models in this series offering 310 horsepower. Facebook Twitter Pinterest LinkedIn Email You May Also Like Can You Boat At Night In Arizona? May 31, 2002 How Do You Have Fun On A Jet Ski? October 6, 2002 Is Jet Ski A Sport? October 18, 2002 Can I Own A Jetski In Nyc? May 14, 2002