Description

Kawasaki STX-12F Engine Rebuild Service (2003–2007 Jet-Ski)

The Kawasaki STX-12F is known for smooth, reliable performance on the water. However, over time, internal wear can lead to power loss, harder starts, and inconsistent operation. When that happens, a proper rebuild brings your engine back to life the right way.

At REV6, we tear down every engine, inspect each component, and rebuild it with corrected clearances and refreshed internals. Because we’ve worked on these engines extensively, we know where issues show up—and we fix them before they turn into bigger problems.

What Gets Rebuilt

This rebuild focuses on restoring compression, improving sealing, and delivering consistent performance on the water.

• Complete teardown, cleaning, and inspection of all components
• Cylinder head cleaned, decked, rebuilt, and verified
• Valve guides inspected and replaced when needed
• Valves and seats recut and vacuum tested for proper sealing
• Camshaft components cleaned, polished, and inspected
• Refurbished crankshaft
• Cylinder inspected, bored and honed, or replaced as needed
• New pistons and rings installed
• Timing chain inspected and replaced when needed
• Engine cases inspected for cracks, wear, and integrity
• All gaskets and seals replaced
• Final assembly torqued to manufacturer specifications

Note: Final build details may vary depending on the condition of your core.

Warranty Coverage

Every engine includes a 1-year warranty. In addition, you can upgrade to a 2-year no-fault plan for complete protection.

Review details on our warranty policy, browse answers in our FAQ, or contact our team for help before ordering.

Core Requirement

This is a build core engine service. You’ll send in your STX-12F engine, and we’ll rebuild and return it ready to install.

Need help with shipping or prep? Visit our Help Center for step-by-step instructions.

Turnaround Time

Most rebuilds ship within 5–10 business days after your core is received.

Take Action

If your STX-12F is losing power or not running like it should, a full rebuild restores smooth performance and dependable operation.

Get back on the water with confidence.

We proudly support veterans and active servicemembers with available discounts—thank you for your service.