This page covers used OEM Kawasaki Jet Ski personal watercraft parts available at Sun Coast Cycle Sports. Kawasaki created the personal watercraft category in 1973 and has produced stand-up and sit-down models spanning two-stroke 400cc singles through four-stroke supercharged 1,498cc inline-fours. Our Florida technicians disassemble Kawasaki Jet Ski donors, photograph each component individually, and list it under its own SKU with free shipping.
Kawasaki Jet Ski generation and parts compatibility
| Platform | Years | Engine | Key details |
|---|
| Stand-up JS/SX (two-stroke) | 1973-2011 | 400-800cc two-stroke twin/single | Multiple generations from JS400 through 800 SX-R. Two-stroke stand-ups ended in 2011 due to emissions regulations. |
| X-2 sit-down | 1986-1995 | 635-650cc two-stroke twin | First mass-produced sit-down PWC. Second-gen X-2 briefly returned in 2006-2007 (Europe only). |
| ZXi / STX two-stroke | 1995-2009 | 900-1200cc two-stroke triple | Includes 900 ZXi, 1100 ZXi, 1100 STX, Ultra 150, 1200 STX-R. All three-cylinder two-strokes. The 900 and 1100 share some engine architecture; the 1200 is a bored-out variant. |
| STX-12F / STX-15F / STX 160 | 2003-present | 1,199-1,498cc four-stroke inline-four | Kawasaki's four-stroke runabout line. STX-12F (2003-2007, 1199cc Ninja ZX-12R-derived). STX-15F (2004-2020, 1498cc). STX 160 series (2020+) shares the STX-15F hull and engine with a redesigned deck. |
| Ultra (four-stroke) | 2007-present | 1,498cc supercharged inline-four | Ultra 250X/260X/300X/310 series. Supercharged version of the same 1,498cc block used in the STX-15F. Current Ultra 310 models produce 310 hp. |
| SX-R 1500 (four-stroke stand-up) | 2017-present | 1,498cc naturally aspirated inline-four | Same engine as the STX-15F/STX 160 in a stand-up hull. Renamed SX-R 160 in 2023. |
The four-stroke 1,498cc inline-four is the common thread across most modern Kawasaki Jet Skis. The STX 160 series, SX-R stand-up, and Ultra 310 all use variants of this engine, derived from the Ninja ZX-14R motorcycle powerplant. The naturally aspirated version (160 hp) powers the STX and SX-R lines, while the supercharged version (310 hp) powers the Ultra series. Many internal engine components are shared between the naturally aspirated and supercharged configurations. However, the hulls are completely different: the STX hull is a lighter, more compact design, while the Ultra hull is larger and heavier with a different deck layout. No hull, deck, or seat components cross between these families. Older two-stroke models share no components with the four-stroke lineup. Within the two-stroke era, the 1100cc and 1200cc triples share some engine architecture (the 1200 is essentially a bored 1100), but the earlier 750cc twins and 900cc triples are separate platforms.
Common Kawasaki Jet Ski failure points and replacement parts
Supercharger rebuild (Ultra 250X/260X/300X/310): The Eaton roots-type supercharger requires periodic rebuilding, typically between 100-200 engine hours. Symptoms of a worn supercharger include reduced top speed, unusual whine, and metal particles in the intercooler. The supercharger assembly, intercooler, and related components are common replacement items on high-hour Ultra models.
Jet pump wear (all models): The stainless steel impeller and wear ring degrade over time, especially in sandy or shallow-water riding conditions. A worn wear ring causes cavitation and loss of thrust. This is a universal maintenance item across all Kawasaki Jet Ski models but is especially common on models ridden in saltwater.
Hull cracking (Ultra platform, 2007-2022): The large Ultra hull is prone to stress cracking near the intake grate and at the sponson mounting points, particularly on higher-hour units that have seen rough water use. Inspect the underside carefully if sourcing hull components.
Electrical corrosion (all models): Saltwater use accelerates corrosion on wiring connectors, stators, and ECU pins. Electrical harness and connector replacements are among the most common parts sought for used Jet Skis, especially those that were operated in coastal saltwater environments.
Two-stroke exhaust and waterbox (pre-2009 models): The exhaust manifold and waterbox assembly on two-stroke Kawasaki Jet Skis corrode from the inside out. Replacement exhaust components for older 900cc and 1100cc/1200cc triples are in high demand as these parts wear out on remaining two-stroke units.
Commonly replaced Kawasaki Jet Ski parts
- Supercharger and intercooler assemblies (Ultra series)
- Impeller, wear ring, and jet pump components
- Electrical harness and connectors
- Exhaust manifold and waterbox (two-stroke models)
- Hull and deck panels
- Fuel injectors, throttle body, and fuel pump
- Seat assembly and storage covers
- Steering components and handlebars
Frequently asked questions
Q: Do STX 160 and STX-15F share the same engine and hull?
Yes. The STX 160 series (2020+) uses the same 1,498cc naturally aspirated inline-four engine and the same hull as the STX-15F it replaced. The primary differences are a redesigned top deck, updated instrumentation, and cosmetic changes. Engine internals, jet pump components, and hull fittings interchange between the two.
Q: Will Ultra 250X supercharger parts fit an Ultra 310?
The Ultra 250X/260X used an earlier generation supercharger setup. The Ultra 300X and 310 series received an upgraded supercharger with higher boost and revised internals. While the base engine block is related, the supercharger assemblies, intercooler plumbing, and ECU calibration differ between these generations. Parts are not directly interchangeable without modification.
Q: Can I use parts from a two-stroke Kawasaki Jet Ski on a four-stroke model?
No. The two-stroke and four-stroke Kawasaki Jet Ski lineups share no mechanical or electrical components. The engines, hulls, jet pumps, electrical systems, and fuel delivery are all completely different between the two-stroke era (pre-2009 sit-down, pre-2011 stand-up) and the four-stroke models.
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