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The Incredible 1999 to 2005 Kawasaki Ultra 150 Jetski: A High-Performance 2-Seater PWC

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Let’s take a journey back to the late 90s and early 2000s when the thrill of speeding across the water on a personal watercraft was at its peak. In this era, Kawasaki unveiled the Ultra 150, a high-performance 2-seater personal watercraft that etched a lasting impression in the hearts of water sports enthusiasts. Produced between 1999 and 2005, the Kawasaki Ultra 150 came packed with a remarkable set of features. Sporting a modified ZXi hull and measuring 113.8 inches in length, 44.4 inches in width, and 40.5 inches in height, it was nothing short of impressive.

Underneath the hood, a potent 2-stroke, 1176cc, triple-carbureted engine roared to life, churning out a staggering 145 HP. Among its advanced features were digital instrumentation, adjustable electric trim, and handlebar-mounted start/stop buttons. With a top speed of 64-65 mph and a fuel consumption of 13.3 GPH at full throttle, this watercraft was tailor-made for adrenaline junkies.

However, the Ultra 150 was not without its peculiarities. Notably absent was a reverse system, a detail that some riders found inconvenient. Short-lived pump bearings and aging oil lines were also issues that owners needed to contend with. The 1999-2000 models, in particular, featured a more high-end ignition system that demanded costly spark plugs. Despite these quirks, the Kawasaki Ultra 150 still stood as an exhilarating choice for water sports enthusiasts, offering a unique blend of power and performance.

Delving deeper into the fascinating realm of the Kawasaki Ultra 150, we will explore its distinctive features, compare different models, and uncover more intriguing details about this thrilling watercraft.

2005 Kawasaki Ultra 150


Kawasaki Ultra 150


The Kawasaki Ultra 150 was a high-performance 2-seater personal watercraft that was manufactured by Kawasaki from 1999 to 2005. This powerful watercraft was designed to provide an exhilarating riding experience with its impressive speed and advanced features. In this article, we will explore the manufacturing years, specifications, unique features, top speed, common problems, the early 1999-2000 models, what makes the Ultra 150 the fastest 2-stroke jetski built, and conclude with a summary of its legacy.

Manufacturing Years

The Kawasaki Ultra 150 was produced between 1999 and 2005. As a result, there are six different model years available to consumers who are interested in purchasing this personal watercraft. Each model year may have slight differences in terms of features and specifications, allowing buyers to choose the one that best suits their preferences and needs.

Overview of Specifications

The Kawasaki Ultra 150 boasted impressive specifications that contributed to its exceptional performance on the water. Let’s take a closer look at its various dimensions and engine specifications.

Storage Cover

In order to preserve the appearance and the finish of your ski you should consider keeping your ski covered when not in use. Checkout the custom fitted cover I recommend below, I feel it is the best cover for the money. You can use the link below to purchase one, it does support my blog and my Youtube channel if you use my link:

Kawasaki Ultra 150 Storage Cover

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Kawasaki Ultra 150 Storage Cover

Jetski Dimensions and Specs:

Length, Width, Height and Weight

The Kawasaki Ultra 150 had a length of 113.8 inches, which provided a stable and comfortable riding experience. This generous length allowed for improved stability and maneuverability, ensuring that riders could confidently navigate through various water conditions.

The width of the Ultra 150 was 44.4 inches, which provided ample space for two passengers. This width allowed for a comfortable seating arrangement while also accommodating additional accessories or storage compartments that riders might require.

The Ultra 150 had a height of 40.5 inches tall, this offered a sleek and streamlined profile. The height ensured that the personal watercraft could easily cut through the water, reducing drag and maximizing performance.

Additionally the ski has a dry weight of 613 pounds, making it lightweight and easy to handle.


Kawasaki Ultra 150 Engine Specs

Type of Engine

The heart of the Kawasaki Ultra 150 is its powerful engine. The Ultra 150 was equipped with a powerful 2-stroke inline 3-cylinder triple carburetor engine that provided unparalleled performance on the water. This engine type delivered an exhilarating riding experience, allowing riders to reach impressive high speeds, making it the perfect choice for thrill seekers.

Kawasaki Ultra 150 Engine


With a displacement of 1176cc, the Ultra 150’s engine delivered impressive power to propel the watercraft through the waves. This displacement allowed for quick acceleration and ensured that riders could experience the thrill of high-speed water adventures. Another name for the ski was the Kawasaki 1200 Ultra 150.


The Ultra 150’s engine was triple-carbed, further enhancing its performance capabilities. The advanced Keihin carburetor system optimized fuel delivery to the engine, ensuring maximum power output and efficiency. The triple-carbed design allowed for smooth and responsive throttle response, enhancing the overall riding experience.

Unique Features:

Modified ZXi Hull

One of the standout features of the Ultra 150 was its modified ZXi hull. This hull design contributed to the personal watercraft’s excellent stability and maneuverability. The modified hull allowed riders to confidently navigate through various water conditions without compromising on speed or control.

Digital Instrumentation

The Kawasaki Ultra 150 came equipped with digital instrumentation, providing riders with clear and accurate information about the watercraft’s performance. The digital display offered vital details such as speed, engine RPM, fuel levels, and more, allowing riders to stay informed and make necessary adjustments while on the water.

Kawasaki Ultra 150 Display 20211003 133508

Adjustable Electric Trim

Another notable feature of the Kawasaki Ultra 150 was its adjustable electric trim system. This feature allowed riders to fine-tune the watercraft’s trim angle, providing optimal balance and control in different water conditions. The adjustable electric trim ensured that riders could easily adjust their riding experience to suit their preferences and achieve peak performance.

Handlebar-Mounted Start/Stop Buttons

Convenience was a focus for Kawasaki when designing the Ultra 150, as evidenced by the handlebar-mounted start/stop buttons. This feature allowed riders to easily start or stop the engine with a simple press of a button, eliminating the need to reach down or fumble with controls while on the water. This user-friendly design ensured that riders could quickly and effortlessly control the watercraft.

Kawasaki Ultra 150 Start Stop Buttons


Top Speed

Maximum Speed

The Kawasaki Ultra 150 offered an impressive top speed of 64-65 mph, allowing riders to experience thrilling high-speed adventures on the water. This exceptional speed ensured that riders could enjoy the adrenaline rush that comes with pushing the limits of performance. The maximum speed achieved by this jetski is a testament to its powerful engine and aerodynamic design.

Fuel Consumption

Despite its high-speed capabilities, the Ultra 150 maintained a reasonable fuel consumption rate. At full throttle, the watercraft consumed approximately 13.3 gallons per hour (GPH). This ensured that riders could enjoy longer rides without constantly needing to refuel, enhancing their overall experience on the water.

Common Problems

Lack of Reverse System

One common drawback of the Kawasaki Ultra 150 was the lack of a reverse system. Unlike some other personal watercraft models, the Ultra 150 did not offer the convenience of a reverse gear. This meant that riders had to be mindful of their positioning and plan their maneuvers accordingly to avoid unnecessary challenges.

Kawasaki Ultra 150 No Reverse

Short-Lived Pump Bearings

Another known issue with the Ultra 150 was the longevity of the pump bearings. Over time, the pump bearings could wear out faster than expected, requiring regular maintenance and replacement. Riders needed to be proactive in monitoring and addressing this issue to ensure the watercraft’s optimal performance.

Aging Oil Lines

The Kawasaki Ultra 150 also had a tendency for its oil lines to show signs of aging. Due to factors such as heat and wear, the oil lines could deteriorate, potentially leading to leaks and compromising the engine’s lubrication system. Regular inspection and maintenance of the oil lines were necessary to prevent any performance or reliability issues and also to prevent catastrophic engine failure.

1999-2000 Models

Upgraded Ignition System

The 1999-2000 models of the Ultra 150 featured an upgraded ignition system that required the use of more expensive spark plugs. This enhancement improved the watercraft’s ignition performance, making these particular models the fastest among all the Ultra 150 models produced. The upgraded ignition system ensured that riders could enjoy even greater speed and responsiveness on the water.

Comparison with 2001-2005 Models

While the 1999-2000 models of the Kawasaki Ultra 150 boasted a more advanced ignition system which made them the fastest among all the Ultra Jetski models, the 2001-2005 models still offered exceptional performance and reliability. The later models benefitted from various improvements and refinements, ensuring a continued exhilarating riding experience for watercraft enthusiasts. Buyers could choose between the different model years based on their individual preferences and priorities in terms of speed, features and overall performance.

The 2005 Kawasaki Ultra 150

The last year for the production of the Ultra 150 was 2005. The 2005 Kawasaki Jet Ski® Ultra® 150 is packed with unique features that set it apart from other personal watercraft. One standout feature is the Steering Assist System, which enhances maneuverability and control, allowing you to navigate through tight turns with ease.

The body material of the Jet Ski® is made of Sheet Molded Compound (SMC), providing durability and resistance to wear and tear. The hull material is Fiberglass Reinforced Plastic (FRP), ensuring strength and stability in the water. The deep V hull type improves stability and handling, while the sponsons increase buoyancy and enhance cornering performance.

The Ultra 150 features digital instrumentation, providing you with accurate and real-time information about your ride. It also comes equipped with a trim system and an automatic siphon bilge system for added convenience and safety. The storage options of the Jet Ski® include a glove box/dash storage and a front storage compartment, allowing you to keep your personal belongings secure during your ride. Lastly, rear view mirrors come standard on the 2005 Kawasaki Jet Ski® Ultra® 150, ensuring visibility and safety while on the water.

Checkout these two videos of a 2005 Kawasaki Ultra 150 that I completely Rebuilt/ Restored here!


Fastest 2-Stroke Jetski Built

The Kawasaki Ultra 150 earned its place as one of the fastest 2-stroke jetskis ever built. With its powerful engine, advanced hull design, and overall performance capabilities, the watercraft delivered an exhilarating ride that enthusiasts could appreciate. The combination of speed, agility, and performance makes the Ultra 150 a top choice for thrill seekers, racers, and watercraft enthusiasts.

Racing Success

The Kawasaki Ultra 150 also achieved significant success in the world of racing. Its exceptional performance and handling made it a popular choice among professional and amateur racers alike. The watercraft’s capabilities allowed riders to compete at the highest levels, showcasing Kawasaki’s dedication to producing competitive machines.

Comparison with Competitors

When comparing the Ultra 150 to its competitors, it became evident that Kawasaki had set a high standard. The watercraft’s top speed, advanced features, and overall performance stood out in the market. While other manufacturers offered their own impressive models, the Ultra 150’s combination of power, agility, and reliability solidified its place as a leading 2-stroke jetski.

Frequently Asked Questions FAQ’s About The Kawasaki Ultra 150

  1. What is the Kawasaki Ultra 150?
    • The Kawasaki Ultra 150 is a personal watercraft (PWC) that was manufactured by Kawasaki in the late 1990s.
  2. When was the Kawasaki Ultra 150 first introduced?
    • The Ultra 150 was first introduced in 1999.
  3. Is the Kawasaki Ultra 150 still in production?
    • No, the Kawasaki Ultra 150 is no longer in production. It was discontinued after 2005.
  4. What is the engine size of the Ultra 150?
    • The Kawasaki Ultra 150 is powered by a 1200cc, two-stroke, three-cylinder engine.
  5. What is the top speed of the Kawasaki Ultra 150?
    • The top speed of the Ultra 150 is approximately 60-65 miles per hour (96-105 km/h).
  6. How many passengers can the Ultra 150 accommodate?
    • The Ultra 150 is designed for one to two passengers.
  7. What type of oil does the Ultra 150 use?
    • The Kawasaki Ultra 150 uses two-stroke oil mixed through the carburetors with gasoline.
  8. What is the fuel tank capacity of the Ultra 150?
    • The fuel tank capacity is around 15.3 gallons (57.9 liters).
  9. How much does the Kawasaki Ultra 150 weigh?
    • The dry weight of the Ultra 150 is approximately 613 pounds (278.1 kilograms).
  10. Can I tow a tube or water skier with the Ultra 150?
    • Yes, the Ultra 150 is capable of towing tubes or water skiers, it does have mirrors for rear view visibility if a rider falls down.
  11. Is the Ultra 150 a stand-up or sit-down PWC?
    • The Ultra 150 is a sit-down PWC.
  12. What are some common maintenance tasks for the Ultra 150?
    • Regular maintenance tasks include oil injection line inspection and replacement, spark plug replacement, impeller inspection, cooling system flushing and hull cleaning.
  13. Are there any known issues with the Ultra 150?
    • Common issues include wear and tear on the impeller, electrical problems, and carburetor maintenance.
  14. Can I use the Ultra 150 in saltwater?
    • Yes, the Ultra 150 can be used in saltwater, but it’s important to flush it and rinse it thoroughly after each use to prevent corrosion.
  15. What is the recommended oil-to-fuel ratio for the Ultra 150?
    • The recommended oil-to-fuel ratio is typically 50:1 for pre-mix, you can run it on 40:1 to be sure it is getting a sufficient amount of oil, but you should consult the owner’s manual for specifics.
  16. How often should I change the spark plugs in the Ultra 150?
    • Spark plugs should be replaced at the start of every season and if you feel the engine running rough at any time during the current season.
  17. Does the Ultra 150 have reverse capability?
    • No, the Ultra 150 does not have reverse; it’s a forward-only PWC.
  18. Are there any aftermarket upgrades available for the Ultra 150?
    • Yes, there are various aftermarket performance and appearance upgrades available for the Ultra 150.
  19. How do I winterize my Kawasaki Ultra 150?
    • To winterize, you should stabilize the fuel, fog the engine, and store it in a cool, dry place.
  20. Where can I find replacement parts and accessories for the Ultra 150?
    • You can find replacement parts and accessories through Kawasaki dealers, online marketplaces, and PWC-specific retailers.



The Kawasaki Ultra 150 left a lasting impact on the world of personal watercraft with its exceptional performance and advanced features. From its modified ZXi hull to its handlebar-mounted start/stop buttons, the watercraft offered a thrilling and user-friendly riding experience. While it had its share of common problems, such as the lack of a reverse system and aging oil lines, these issues did not overshadow the Ultra 150’s overall performance and capabilities. The 1999-2000 models stood out with their upgraded ignition system, making them the fastest of all the Ultra 150 models. As a testament to Kawasaki’s reputation and history, the Ultra 150 cemented the company’s position as a top manufacturer in the industry.


Although the production of the Kawasaki Ultra 150 jetski ended in 2005, its legacy continues to live on in the hearts of watercraft enthusiasts. The personal watercraft’s exceptional performance, unique features, and racing success ensured that it left a lasting impression on riders. Kawasaki’s commitment to providing thrilling and reliable watercraft experiences remains evident in their current lineup, allowing riders to continue enjoying the excitement and adventure that the Ultra 150 represented.

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