This listing is for a professionally rebuilt complete engine for the Kawasaki STX-15F, one of the most popular and reliable Jet Ski models on the market. The engine has been completely disassembled, cleaned, inspected, rebuilt with OEM or OEM-equivalent components, and is now ready for direct installation.
Whether you’re replacing a blown engine or restoring a watercraft, this engine offers factory-like performance, smooth operation, and peace of mind.
🔧 Engine Overview:
•Engine Type: 4-Stroke, Inline 4-Cylinder
•Displacement: 1,498cc
•Valve Train: DOHC (Dual Overhead Camshafts), 16 Valves
•Cooling System: Open-loop water cooling
•Fuel System: Multi-port Fuel Injection (EFI)
•Lubrication: Semi-dry sump system
•Ignition: Digital
•Compression Ratio: Approximately 10.6:1
•Rated Output: ~160 HP (varies slightly by model year)
•Compatible Fuel: Unleaded gasoline (91+ octane recommended)
✅ What’s Included – Complete Long Block (Fully Rebuilt):
This is a drop-in long block setup that includes:
•✔️ Cylinder block with crankshaft, connecting rods, and pistons
•✔️ Cylinder head with new or reconditioned valves, valve springs, camshafts
•✔️ Timing chain, guides, tensioner – all replaced with new components
•✔️ Valve cover (repainted or replaced if necessary)
•✔️ Oil pump and oil pan – thoroughly cleaned and resealed
•✔️ Flywheel and stator (installed)
•✔️ Thermostat housing
•✔️ Intake and exhaust manifolds
•✔️ Complete set of new OEM-quality gaskets and seals
•✔️ Engine mounts included (if requested)
This engine does NOT include the ECU, wiring harness, or throttle body by default – but these can be supplied upon request.
🔄 Rebuild Process (Step-by-Step):
Every engine undergoes a full rebuild process performed by experienced technicians:
1.Complete disassembly – Engine taken apart down to the bare block
2.Deep cleaning – All parts cleaned in ultrasonic and/or chemical tanks
3.Crankshaft and block inspection – Checked for cracks, damage, or warping
4.Cylinder honing or boring (if needed) – To ensure proper ring seal
5.New piston rings, gaskets, seals, bearings, and timing components installed
6.Cylinder head fully serviced – Valves reseated or replaced, guides checked
7.Cam timing and torque values set to factory specs
8.Compression tested and leak-down tested before shipment
9.Final inspection and cleaning
10.Packed securely in a professional crate, ready to ship
🧰 Condition:
•🔧 Professionally rebuilt – not just “refreshed” or “used”
•🧼 Zero rust, zero corrosion – all surfaces cleaned and resurfaced
•⚙️ Compression-tested and verified
•💯 Ready to be installed and started
This engine has not been run in salt water since rebuild, and has been stored indoors in a controlled environment.
📌 Compatibility:
This engine is compatible with the following models:
•✅ Kawasaki STX-15F (2004–2023)
•✅ May also be compatible with Ultra LX or similar MR1-based Kawasaki models (verify engine code)
