When the engines of watersport vehicles exhibit rough operation, it is advisable to utilize a STA-BIL® Marine Tune-Up. This user-friendly additive can be poured directly into the fuel tank to remedy problems associated with ethanol-blended fuels or simply neglected fuel systems. A single application is sufficient to rejuvenate diminished engine performance in any gasoline-powered watercraft, including jet skis, speed boats, and personal watercraft. Consider using it the next time your engine does not perform as smoothly as you recall.