Guides: Maintenance

Guides to storing, trailering and caring for a jet ski, plus help choosing the right cover size.

  • Jet ski on its trailer in a driveway beside a closed garage door on a gray late-winter day, under a gray and black AllGuard Weatherproof Shield cover

    Maintenance 23 min read

    Why Does My Jet Ski Battery Keep Dying?

    Key-off draw, self-discharge, accessories, bad connections or the charging system: what Yamaha, Sea-Doo, Kawasaki and battery makers say runs a jet ski battery flat.

  • Jet ski on its trailer beside a garden shed in autumn, under a blue and black AllGuard Weatherproof Shield cover

    Storage 24 min read

    How Long Can a Jet Ski Sit Without Being Used?

    No source cited here sets a limit. Here are the time frames Yamaha, Sea-Doo, Kawasaki and BoatUS give for fuel, battery and engine, and how to restart or clean a jet ski that sat.

  • Small black battery on a garage workbench, red and black clamps on its posts, wired to a blue maintainer with a green light

    Maintenance 24 min read

    How to Charge and Store a Jet Ski Battery

    Take the battery out negative cable first, charge it off the craft and refit it positive first: Yamaha, Sea-Doo and Kawasaki steps, charger rules and storage schedules.

  • Jet ski on its trailer under a red and black AllGuard Weatherproof Shield cover on a wet driveway after rain

    Maintenance 20 min read

    Water in Your Jet Ski Hull: How Much Is Normal?

    A little water in a jet ski hull is expected. What Sea-Doo, Yamaha and Kawasaki say about where it comes from, how to drain it, and when water means a dealer visit.

  • Gloved hands scrubbing soapy suds into a gray vinyl jet ski seat with a soft-bristle brush

    Maintenance 16 min read

    How to Get Mold Out of Jet Ski Seats

    Remove mold and mildew from a vinyl jet ski seat step by step, see where vinyl makers and boating groups disagree on bleach, and store the seat so it stays dry.

  • Sit-down jet ski on a trailer in a driveway under a gray and black Weatherproof Shield cover

    Maintenance 17 min read

    Jet Ski Maintenance: Tips to Prolong Its Lifespan

    What to do before and after every ride, each season and before storage: how to flush, oil-change intervals by make, battery, fuel and seat care, and covering.

  • Jet ski on its trailer in a sunny spring driveway under a red and black AllGuard Weatherproof Shield cover

    Winterizing 28 min read

    How to De-Winterize a Jet Ski for Summer

    De-winterize a jet ski in spring: charge and refit the battery, check fluids, fuel and plugs, flush and start within each maker's limit, then check the hull and trailer.

  • An old battery with a dusty case and corrosion crusted on its terminals beside a clean new black battery on a garage workbench

    Maintenance 23 min read

    How Long Do Jet Ski Batteries Last?

    Battery makers' lifespan figures by type, what shortens a jet ski battery's life, signs it's failing, the voltages to expect, each maker's jump-start rules and Sea-Doo steps.