Why Won't My Jet Ski or WaveRunner Start - WaveRez®

Why Won’t My Jet Ski or WaveRunner Start

Yamaha Waverunners (specifically operated on salt water) occasionally run into some corrosion and battery issues, which is the most common reason why your equipment randomly won’t start. Whether you’re a private owner or tour company, you may be left asking “why won’t my jet ski start?”. But don’t worry, here’s how to fix it quickly.


Trouble Shooting

Getting your jet ski to run starts with troubleshooting the issue. After years of working with jet ski’s, specifically the Yamaha EX model, I’ve been able to diagnose countess starting issues. Here’s what to look for when your waverunner won’t work.

1. If you’re trying to start it and the digital screen is trying to flash and it sounds like it might start

First thing, check the connections of the cable to the battery and make
sure the battery isn’t damaged and is secure. (Tip: You can wiggle the cables
while trying to start the engine to quickly get it started back up and make it
back to your dock.) If it starts while manipulating the cables then you most
likely have a corroded or loose connection. You’ll need to clean the terminals
and connectors with a wire brush and some battery terminal cleaner to clear the
corrosion and make a solid connection.

2. If once the connections are clean, it’s still struggling to start and flashing the digital screen

You may have a bad or dead battery. You can take the battery out and attempt to charge it to see if this fixes the issue, first. You will often here clicking while trying to start if this is the issue.


What Not To Do

DO NOT CHARGE THE BATTERY INSIDE OF THE SKI. This can lead to a build up of fumes and one small spark from the battery connections can ignite it quickly. It’s also important to use the correct amperage charger for your battery.


Next Steps

Rental jet skis can experience hydro lock from misuse

If charging the battery does not improve it’s likelihood to start, you can have it tested by a local auto/marine shop. There may be something wrong with other components of the jet ski causing it to fail while starting.

1. The Starter

Occasionally on a jet ski or waverunner, you’ll run into issues with the starter being your culprit. You can usually hear the starter hanging up when attempting to start. You can try to manually bang on the starter to loosen it temporarily in stranded on the water situations.

Usually, if you’d checked all the other potential issues and you’re still having intermittent or non starting issues than this will be your next part to be considering.

If the ski’s digital display is coming on solid and normal but it’s struggling to turn over while starting, than it’s most likely your starter. A mechanic will most likely be needed to replace the starter.

2. Hydro Lock

If the engine has been submersed in water and attempted to start with water up over the engine and it’s no longer starting, you may also be hydro locked. In which case, you’ll need to get a mechanic involved soon to clear the water from the engine in order to fix it and avoid corrosion.

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