Fastest Jet Ski in the World: Top Speeds & Models

By Sarah Miller · May 17, 2053

The fastest jet ski in the world is the Kawasaki Ultra 310LX, capable of reaching speeds up to 68 mph (109 km\/h) thanks to its supercharged 1,498cc engine and advanced hull design optimized for high-speed performance.

What Makes a Jet Ski Fast?

Several key factors determine the top speed of a personal watercraft (PWC), commonly known as a jet ski. These include engine power, hull design, weight, and rider conditions. Understanding these elements helps explain why certain models dominate in speed.

Key Performance Factors

Engine displacement and horsepower: Larger engines with higher output generate more thrust.
Supercharging or turbocharging: Forced induction systems significantly boost power and acceleration.

Hull shape and hydrodynamics:

Rider weight and load: Heavier loads decrease top speed and acceleration.
Water conditions: Calm waters allow for maximum velocity, while waves create resistance.

Top High-Speed Jet Ski Models Compared

While many PWCs are built for leisure, several models are engineered specifically for performance and speed. The following table compares the fastest commercially available jet skis based on verified manufacturer data and third-party testing.

Model	Engine (cc)	Horsepower	Top Speed (mph)	Top Speed (km\/h)	Weight (lbs)	Year Introduced
Kawasaki Ultra 310LX	1,498	310	68	109	954	2014
Yamaha GP1800R SVHO	1,812	250	67	108	834	2020
Sea-Doo RXT-X 300	1,494	300	66	106	885	2017
Kawasaki Ultra 310R	1,498	310	65	105	935	2014
Yamaha FX Cruiser HO	1,812	180	58	93	824	2010

Table data source:1, 2, 3

The data shows that the Kawasaki Ultra 310LX holds the edge in top speed, achieving 68 mph due to its powerful 310-horsepower supercharged engine. Despite being heavier than competitors, its refined hull and ride plate system enhance tracking and reduce drag. Yamaha's GP1800R SVHO comes close at 67 mph, benefiting from a larger displacement engine but slightly less aggressive tuning.

Performance Enhancements and Modifications

Enthusiasts often modify their jet skis to exceed factory speeds. Common upgrades include:

Aftermarket exhaust systems for improved airflow
Reprogrammed ECU for aggressive fuel mapping
Impeller upgrades for greater thrust efficiency
Intake grates and ride plates for better water flow
Lightweight body kits to reduce overall mass

With modifications, some Ultra 310 models have been reported to reach speeds over 80 mph under ideal conditions.

Safety Considerations at High Speeds

Riding at extreme velocities requires enhanced safety awareness. At speeds above 60 mph, even small obstacles can cause serious accidents. Recommended safety practices include:

Wearing a high-impact life jacket with spray hood
Using a kill switch lanyard at all times
Avoiding crowded areas and choppy waters
Maintaining regular service intervals for engine reliability
Completing an advanced riding course for handling techniques

Frequently Asked Questions About the Fastest Jet Skis

What is the top speed of the fastest production jet ski?

The Kawasaki Ultra 310LX reaches a top speed of 68 mph (109 km\/h), making it the fastest production jet ski available as of 2025.

Can any jet ski go faster than 70 mph?

No stock jet ski exceeds 70 mph. However, heavily modified versions of the Kawasaki Ultra 310 have achieved speeds over 80 mph in controlled environments.

Why is the Kawasaki Ultra 310LX faster than other models?

It combines a 310-horsepower supercharged engine with an aerodynamic hull and precise steering control, allowing superior acceleration and top-end performance compared to rivals.

Are faster jet skis harder to handle?

Yes, high-speed PWCs require more skill to operate safely. Increased speed amplifies response time and instability risks, especially in rough water or tight turns.

Does engine size always mean higher speed?

Not necessarily. While larger engines like Yamaha’s 1,812cc provide strong torque, overall speed depends on power-to-weight ratio, supercharging, and hull efficiency—factors where smaller, lighter, and better-tuned models may outperform.