Jet Pump &
Impeller Service.

The Most Overlooked Part of Your Ski

Most riders don't think about the jet pump until the ski stops pulling right. By then, the impeller might be chipped down to nothing and the wear ring is opened up enough that you're bleeding pressure on every pass. The pump sits underwater, processes everything that gets sucked in — sand, shells, rocks, rope, you name it — and takes a beating most riders never inspect.

We pull pumps as part of every annual service, every diagnosis involving power loss, and any time a rider tells us the ski doesn't feel like it used to. Nine times out of ten, the pump tells us something. Even skis with low hours that have been in sandy, silty water show impeller wear because fine abrasive material gets in constantly and slowly erodes the blade edges.

What a Worn Impeller Does to Your Performance

A chip in an impeller blade creates turbulence in the water flow through the pump. Turbulence kills efficiency. A significantly chipped or eroded impeller can cost 5–10 mph at top speed and make a noticeable difference in how the ski accelerates out of the hole. A fully worn impeller with gaps between the blade tips and the wear ring loses even more.

Most riders don't notice until the degradation has been going on for a full season or two. When they bring the ski in for something else and we pull the pump, they're surprised at the condition. A new impeller and wear ring puts those mph back immediately.

Performance Upgrade vs. Stock Replacement

If you're replacing the impeller anyway, it's worth considering an upgrade to a stainless steel unit rather than going back to stock. Cast aluminum and composite impellers work, but stainless is harder and more resistant to chip damage — it holds its pitch longer in abrasive water conditions.

Beyond material, pitch matters. Stock impellers are pitched for the middle of the range — neither optimized for top speed nor for acceleration. A performance impeller pitched higher will give you more top end at the cost of some low-end pull. Pitched lower does the opposite. We'll recommend what makes sense based on how you ride, your weight, and what your specific model responds to best.

Done right, an impeller upgrade is one of the best single modifications you can make to a jet ski for the cost. The improvement is mechanical, not electronic, and it's there every time you ride.