Cavitation, RPM up with speed down, rattle in reverse — the pump is talking. Wear rings, impellers, bearings, and seals serviced for every PWC brand, verified in the test tank.
Here's the pattern we see every summer: a machine that "lost power" almost never lost power — it lost pump. The engine spins to full RPM, the speedometer stops ten short, and the owner starts pricing engine work. Then we pull the pump and find a chewed wear ring, an impeller with rounded edges from one gravel launch, or bearings that have been grinding since June.
Texas water does it faster than most. Our lakes run shallow and sandy, launch points are silty, and one shoreline start ingests more abrasive than a hundred deep-water hours. The pump takes that abuse first and quietly converts it into clearance — and clearance is thrust you paid for leaking around the impeller tips.
The fix is honest, mechanical work: measure the clearances, replace the wear ring, recondition or replace the impeller, and reseal the driveline. It's a fraction of the "engine problem" it masquerades as, and it's core work in the watercraft program. If the symptoms are murkier than classic cavitation, marine diagnostics sorts pump from engine before any parts get ordered.
Every brand's pump has its temperament: Sea-Doo wear rings are designed as replaceable fuses and love routine service; WaveRunner pumps run famously tight and reward early bearing attention; Kawasaki's oil-bathed hubs have their own interval. We service all three to spec, and every pump job ends in the test tank — thrust proven, not promised.
Riding spots matter too. If your season lives at the sandy launches around Houston's lakes and bays, a mid-season pump inspection is the cheapest speed insurance you can buy — five minutes of measurement against a summer of slow.
What fresh clearances unlock: the speed you already paid for. A machine that lost eight mph to a chewed wear ring gets them all back for a fraction of the engine work it was masquerading as needing — plus hole shot, chop performance, and the fuel economy that leaks away with thrust. Pump service has the best performance-per-dollar ratio of anything in the marine bay, because it doesn't add capability; it returns it.
The inspection unlock matters too: a pump apart is a driveline visible. Carbon seal, driveshaft splines, and bearing condition all get read during the same labor — catching the weep that would have been a sunk-hull story in August.
The repitch question, answered honestly: impeller pitch is a trade, not an upgrade — steeper pitch buys top speed and costs hole shot; flatter buys launch and tow-sport pull and costs a few mph up top. Stock pitch suits most stock machines; the conversation gets interesting on tuned builds where the power curve moved and the pump never heard about it.
And the honest limit: pump service can't fix an engine problem wearing a pump costume. When RPM is down along with speed, the story is upstream — which is why murky symptoms get the diagnostic session first, so you spend on the actual fault.
A jet pump is a precision water tool living in sandpaper. Three disciplines keep the rebuild honest.
Impeller-to-ring clearance has a spec measured in thousandths, and thrust obeys it ruthlessly. We measure before recommending and after assembling — "looks okay" is how machines stay slow at full price.
Rounded leading edges, cavitation burn, and stone nicks each cost speed in their own way. Where the blade material allows, professional reconditioning restores the edge geometry; where it doesn't, we say replacement plainly — a dressed-past-spec impeller is a compromise wearing a discount.
Pump bearings get fresh oil and seals on every rebuild, the carbon seal and boot get inspected while access is free, and reassembly torque is by the book with thread treatment where the platform calls for it. Water stays outside the hull; thrust stays inside the pump.
Same documented sequence as everything in the marine bay — full detail on the build process page.
RPM, speed, sounds, and where you launch — the sandy-launch story usually names the culprit early.
Pump out, clearances measured against spec, driveline inspected while access is free. Findings photographed.
Ring, impeller work, bearings, and seals as the measurements dictate — quoted in writing first.
Thrust proven in the test tank before pickup. Speed returned, documented, done.
High RPM with weak acceleration — the engine revs but the machine surges or bogs instead of pulling, especially from a start or in chop. It feels like a slipping clutch in a car. That's air and turbulence where solid water should be, and worn pump clearances are the usual reason.
Lost top speed with normal RPM, cavitation off the line, or visible scoring in the ring and rounded impeller edges. We measure the actual clearance rather than eyeballing — the spec tells the truth. Grooved ring, damaged blades, or clearance past spec: service time.
Stop riding it — running a fouled or damaged pump grinds the damage deeper. A rope or tow strap often unwinds without harm; rocks and shells usually cost a ring and impeller edge work. We'll assess it honestly; catch it same-week and it's routine service, not a driveline job.
The usual suspects live in the pump area: a weeping carbon seal, tired driveshaft seals, or loose pump hardware. Small leaks become big ones on their own schedule, so a bilge that's suddenly earning its keep is worth a same-month inspection.
Yes — pitch changes trade top speed against hole shot, and the right choice depends on how you ride and what else is modified. Stock pitch suits most stock machines; tuned and supercharged builds often benefit from repitching. It's part of the performance conversation alongside RIVA-sourced upgrades.
Pump health is the foundation of every marine performance conversation — these catalogs build on it.
Tell us the symptoms — RPM, speed, and where you launch. We'll measure the pump, show you what we find, and put the thrust back where it belongs.
(713) 555-0182