PWC / Jet Ski

How to Winterize a Jet Ski

Protect your Sea-Doo, Yamaha WaveRunner, or Kawasaki Jet Ski from freeze damage, stale fuel, and corrosion — with a step-by-step guide you can follow yourself.

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Why winterizing matters

Jet skis live in a harsh environment: water, heat, salt, and vibration. When the season ends, any water left inside can freeze and expand, cracking the engine block, exhaust manifold, intercooler, or jet pump. Fuel goes stale in as little as 30 days and can leave varnish that clogs injectors and carburetors. A proper winterization is cheap insurance against a very expensive spring surprise.

What you'll need

  • Marine fuel stabilizer
  • Fogging oil (spray can)
  • RV/marine antifreeze (optional, for hard-freeze climates)
  • Garden hose and flush adapter
  • Basic hand tools and rags
  • Smart battery maintainer / trickle charger
  • Breathable cover or tarp

Model-specific notes

Sea-Doo supercharged models may need the intercooler drained. Yamaha 4-strokes have specific fogging procedures. Kawasaki 2-strokes need oil-injection and power-valve care. If you're unsure about the exact sequence for your year, make, and model, a 30-minute Quick Fix call is the fastest way to get it right.

Winterize your PWC in 8 steps

  1. 01

    Wash and dry the hull thoroughly

    Rinse salt, sand, and grime from the hull, pump intake, jet pump, and ride plate. Dry it completely so moisture doesn't sit in crevices all winter.

  2. 02

    Stabilize the fuel system

    Fill the tank at least 90% full to minimize condensation. Add marine fuel stabilizer per the label. Run the engine for 60–90 seconds on the hose to circulate treated fuel through the injectors or carburetors.

  3. 03

    Flush the cooling system

    Hook up the hose flush and run the engine for the time specified in your manual (usually 1–2 minutes). Never run dry without water. Then drain all water from the cooling passages, exhaust, and pump.

  4. 04

    Fog the engine (4-stroke and 2-stroke)

    Remove the air intake and spray fogging oil into the throttle body while the engine idles until it smokes slightly and stalls. This coats internal parts and prevents corrosion. Follow your manual for direct-injection or supercharged models.

  5. 05

    Run antifreeze where recommended

    Some owners in hard-freeze climates run RV/marine antifreeze through the cooling system. We'll show you the correct fill and drain points for your model on a video call.

  6. 06

    Protect the battery

    Remove the battery, clean the terminals, and store it on a smart maintainer in a cool, dry place. Do not leave it on a concrete floor — a wooden shelf or battery box is better.

  7. 07

    Lubricate and seal openings

    Lubricate cables, pivots, and the jet-pump nozzle. Stuff the intake grate and exhaust outlet with rags or foam plugs to keep rodents and moisture out. Leave the seat or storage lid slightly cracked for ventilation.

  8. 08

    Store it covered and off the ground if possible

    Use a breathable cover, store out of direct sun, and keep weight off the tires. If storing on a trailer, consider blocking the frame so the suspension doesn't sag.

FAQ

Do I really need to winterize a jet ski?
Yes. Freezing water in the exhaust, cooling passages, or pump can crack housings, ruin the engine, and cost thousands. A proper winterization also protects the fuel system, battery, and internals from corrosion and stale-gas damage during storage.
Can I winterize a jet ski myself?
Most owners can do the basics in 30–60 minutes with common hand tools. A Quick Fix video call with ProWrench Live covers your specific Sea-Doo, Yamaha, or Kawasaki model so you don't miss model-specific steps like antifreeze fill points or fogging ports.
What happens if I don't winterize?
Unprotected engines can freeze and crack, fuel turns to varnish and gums injectors/carburetors, batteries sulfate and die, and corrosion accelerates in the pump and intercooler. Spring repairs often cost far more than a 30-minute prevention call.
How much does it cost to winterize a jet ski?
DIY supplies typically run $20–$60. Dealer winterization packages often run $150–$400 plus pickup/delivery. A ProWrench Live Quick Fix call ($50, 30 min) walks you through the job yourself with a mechanic on video.
Can you help me de-winterize in spring too?
Absolutely. We'll cover battery reinstall, fuel system check, cooling-system inspection, hose-flush flow test, and a pre-launch run-over so you're confident before the trailer hits the ramp.

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