5 Common Jet Ski Problems
And What They Actually Mean

Jet skis are simple in principle and finicky in practice. Most of the calls we get come down to a handful of symptoms — and knowing what each one usually means helps you decide whether to keep riding, shut it down, or pick up the phone. Here are the five we see most.

1. It Won't Start

The usual suspects, in order: a dead or weak battery, stale fuel from sitting too long, fouled spark plugs, or a security/lanyard issue (make sure the kill-switch clip is seated). After a winter of sitting, stale fuel and a dead battery cause the vast majority of no-starts.

2. Overheating or No Telltale Stream

If the telltale ("pisser") stream stops or the machine overheats, shut it down. It usually means the cooling passages are blocked — often by sand, weeds, or debris picked up in shallow water. Running it anyway risks serious, expensive engine damage.

3. Vibration or Loss of Thrust

A new vibration or a ski that won't get up to speed almost always points to the impeller or wear ring — frequently from sucking up rope, weeds, sand, or debris. Sometimes it's an object lodged in the pump; sometimes the impeller is nicked. Either way it's worth checking before it does more damage.

4. Warning Beeps or Fault Codes

Modern PWCs beep and store fault codes for a reason. A beep on startup or mid-ride could be low oil, overheating, or a sensor fault. The only way to know is to pull the codes with a manufacturer-grade scan tool — guessing wastes money. This is a big reason mobile diagnostics beats trial-and-error parts swapping.

5. Water in the Hull

A little water is normal; a lot is not. Check the drain plugs first, then look for failed seals or a cracked hose. Persistent water in the hull can lead to electrical problems or, worst case, water reaching the engine — so don't ignore it.