Engines, Impellers & Component
About Engines, Impellers & Component
The engine and the jet pump are the heart of a personal watercraft, and this category holds the parts that wear in them. The listings include piston kits and cylinder kits, stators, jet pumps, wear rings, intake grates, drive parts and impellers. Owners shop here for a top-end rebuild, to restore performance lost to a worn pump, or to fix a charging or ignition problem.
For engine work, parts are listed by model and often by size. Piston kits give the bore size in millimeters, such as 75.50 or 76.50, and they come in sizes to suit a standard or rebored cylinder, so your cylinder measurements decide which kit you need. Check the listing for what a kit includes, such as gaskets or rings. For the pump, the impeller, wear ring and shaft are listed by model, and some jobs need a special impeller tool. Match parts to your make, model and year, and use your service manual for clearances and torque values.
All the impeller listings sit in Impellers & Components. Brands here include Vertex, Solas, WSM, Worx and Riva. For the rest of the machine, see Ignition & Starting Systems, Intake & Fuel Systems and Exhaust, part of PWC. Pick your machine in the Ride Finder at the top of the page.
FAQs on jet ski engine and pump parts
What size piston do I need for my jet ski engine?
It depends on the model and on the condition of your cylinder. Piston kits are listed by bore size in millimeters, in a standard size or oversize steps for a rebored cylinder. Measure the cylinder against the limits in your service manual before choosing.
What should I check when rebuilding a jet ski top end?
Check the cylinder walls for scoring, measure the bore and piston clearance against the manual, replace the gaskets and look at related parts such as the reeds or crank seals. Follow the manual's torque values and the order of assembly.
How can I tell if a jet ski stator has failed?
Typical signs are a battery that will not stay charged and weak or missing spark. A stator can be tested with a meter against the resistance values in your service manual, so test it before you replace it.
Do I need a special tool to change an impeller?
On many models, yes. Impellers are held on the shaft and often need a tool to hold them and to remove or install them without damage, and listings for impeller tools are available. Check your manual for the method for your model.
