The Watercraft Journal test rides RIVA Racing’s insanely-fast 2018 RIVA Racing-Edition GP1800R. Starting with a stock 2018 Yamaha GP1800 WaveRunner, RIVA Racing throws its Stage II kit and a whole lot more at this limited-edition machine that is hand-built for the first 25 customers each year. The GP1800 is already one of the winningest runabouts […]