The Complete Jetski Maintenance Checklist Every Rider Needs Before Summer

Summer is almost here and the water is calling. If you skip a quick check on your jetski, you could end up stuck on the dock while everyone else is out having fun. At JetStream Adventures we love a smooth ride, so here’s a simple, no‑stress checklist to get your machine ready for the heat.

Why a Quick Check Saves You Time (and Money)

A jetski that’s not looked after can lose power, make weird noises, or even break down mid‑ride. Fixing a problem on the water is a lot harder (and pricier) than catching it in the garage. This checklist takes under an hour, and it will keep you riding longer and spending less on repairs. Trust me, I’ve learned the hard way during a sunrise session on Lake Tahoe – a loose spark plug almost ruined the whole day.

1. Visual Inspection – The First Look

Walk Around the Hull

Look for cracks or dents. Small cracks can let water in, which is bad for the engine.
Check the paint. Faded or peeling paint means the protective layer is gone. A quick touch‑up helps stop rust.

Inspect the Deck and Seats

Make sure the deck is clean. Sand or grit can scratch the hull when you launch.
Check seat bolts. Tighten any loose bolts with a simple wrench.

2. Fuel System – Keep the Engine Happy

Fresh Fuel

Drain old fuel if it’s been more than three months. Old fuel can gum up the carburetor.
Fill with fresh gasoline that has the right octane rating (check your owner’s manual). At JetStream Adventures we always use the fuel the manufacturer recommends.

Fuel Lines and Filter

Look for cracks in the fuel hose. A cracked hose can leak and cause a fire.
Replace the fuel filter if it looks dirty. It’s cheap and saves the engine from clogging.

3. Engine Check – The Heartbeat

Oil Level

Pull the dipstick and check the oil. It should be between the “low” and “full” marks.
Top up or change if it’s low or looks dirty. Fresh oil keeps the engine cool and lubricated.

Spark Plug

Remove the spark plug and look at the tip. It should be light brown, not black or oily.
Clean or replace it if needed. A clean spark plug means a smooth start.

Cooling System

Check the water intake grate for debris. Clear any leaves or seaweed.
Inspect the impeller (the little fan that pulls water). If the blades are worn, replace it. A bad impeller can overheat the engine fast.

4. Electrical System – Lights, Horn, and More

Battery

Check the charge with a multimeter (or take it to a shop). It should read around 12.6 volts when the engine is off.
Clean the terminals if they look corroded. A little baking soda and water does the trick.

Lights and Horn

Test the headlight, tail light, and turn signals. Replace any burnt‑out bulbs.
Press the horn to make sure it works. You never know when you’ll need to alert another rider.

5. Steering and Controls – Stay in Command

Steering Cables

Move the handlebars from left to right. Feel for any slack or rough spots.
Lubricate the cables if they feel stiff. A little spray oil keeps them smooth.

Throttle and Brakes

Pull the throttle and watch the response. It should be quick, not sluggish.
Test the brake (if your model has one). It should engage firmly.

6. Safety Gear – Don’t Forget the Extras

Life Jacket

Check the fit and condition of your personal flotation device. No tears or broken straps.

Emergency Kit

Carry a small kit with a whistle, a waterproof flashlight, and a basic first‑aid set. At JetStream Adventures we keep a compact kit in the storage compartment.

Rope and Tow Line

Inspect the tow rope for frays. A strong rope can be a lifesaver if you need a tow.

7. Storage Prep – Protect Your Ride When Not in Use

Cover

Use a proper jetski cover that fits snugly. It protects against UV rays and rain.
Secure the cover with straps or bungee cords so it doesn’t blow off in wind.

Dry the Engine

Run the engine for a minute after a ride to flush out water.
Wipe down the hull with a dry towel. Moisture left on the surface can cause rust.

8. Final Test Ride – The Real Proof

Take your jetski for a short spin around the dock. Listen for any odd sounds, watch the gauges, and feel the handling. If everything feels right, you’re good to go for a full day on the water.

My Personal Tip from JetStream Adventures

When I first started teaching at JetStream Adventures, I used to skip the fuel filter change because I thought it was “just a filter.” One hot July afternoon, the engine sputtered and died right in the middle of a lesson. I learned fast: a clean filter is a happy engine. Now I check it every time I prep a bike for a student.

Keep This List Handy

Print this checklist or save it on your phone. A quick glance before each season will keep your jetski running smooth and let you focus on the fun – like catching that perfect wave or racing a friend across the lake.

Enjoy the sunshine, stay safe, and ride hard. JetStream Adventures will be here with more tips, gear reviews, and stories from the water.