Jet Ski Winterizing
on Long Island

Winterizing is the single most important thing you can do to protect your jet ski — and on Long Island, it's not optional. Our winters get cold enough to freeze any water left sitting in the cooling system, and untreated fuel breaks down over months of storage. Skip it, and you risk a cracked engine, corroded internals, or a machine that simply won't start come spring. This guide walks through exactly what a proper winterization involves, when to do it, and how to decide between DIY and a pro.

Why Winterizing Matters

A personal watercraft pumps water through its engine to stay cool. When you pull it for the season, some of that water stays behind — and if it freezes, it expands and can crack the exhaust manifold, cooling passages, or even the engine block. Those are four-figure repairs that a proper winterization prevents entirely. On top of that, modern ethanol-blended fuel absorbs moisture and gums up injectors and carburetors if it sits untreated. Winterizing addresses all of it at once.

When to Winterize on Long Island

The right window is after your last ride but before the first hard freeze — for most Long Island owners that's late October into November. Don't gamble on a warm stretch in December; a single freezing night is all it takes to do damage. If you're not sure you'll get back out, it's better to winterize early than to get caught.

What a Proper Winterization Includes

A complete job is more than pouring in antifreeze. Here's what should happen:

• Fuel stabilization — top off the tank and add stabilizer so the fuel doesn't break down or attract moisture over the winter.
• Engine fogging — fogging oil coats the internal engine components to prevent corrosion while the machine sits.
• Cooling system flush & protection — flush out salt and debris, then run antifreeze through the cooling passages so nothing can freeze.
• Oil change (4-stroke) — old oil holds moisture and contaminants; fresh oil protects the engine through storage.
• Battery care — disconnect and, ideally, keep it on a maintainer so it's healthy in spring.
• Lubrication & corrosion protection — grease fittings and spray down metal components, especially important for boats used in salt water.

DIY vs. Hiring a Pro

A handy owner can do a basic winterization, and if you're comfortable with fogging, fuel stabilizer, and running antifreeze, go for it. Where people get burned is missing a step — an incomplete flush, skipping the fogging, or forgetting the battery — and discovering the problem in May when the season's already starting. If you'd rather not risk it, this is exactly the kind of job we handle: we come to your location, do the full procedure, and you know it's done right. Read more about where we serve across Long Island.

Shrink Wrap & Off-Season Storage

Once the machine is winterized, a properly fitted shrink wrap keeps moisture, UV, and rodents out all season — far better protection than a loose cover. If you're short on space, we also store machines at our waterfront facility in Seaford over the winter, so you don't have to find room in the garage or pay a marina premium.

Come Spring

A machine that was winterized correctly wakes up easy: de-winterize, reconnect the battery, check the systems, and you're back on the water. A machine that wasn't is where the expensive surprises live. Winterizing isn't the exciting part of ownership — but it's what protects everything you spent on the machine in the first place.