How to replace seal on a jet ski

Any motor that runs and then develops sudden stopping symptoms gives me suspicions of fuel delivery problems.
I'm not familiar with your machine, but I would be looking at the fuel filter as probably plugged up.
Wild guess, but sometimes I luck out.
Cheerfuls.

Your stator sounds like it maybe not supplying enough ignition spark when the motor is under a load. When you put the ski in the water the motor is under much more of a load then when out of the water or on a trailer. Those are the signs of a stator going bad. Another option would be leaking crank seals. The seals need to hold pressure to pump the fuel to the motor. Sometimes the crank seals can burn up the stator if the seals are leaking. You can remove the flywheel cover and to inspect for a leaky front crank seal. It should be dry inside, but if it is all oily and wet, your seals are leaking.

sounds like the carbs need stripping and the jets etc unblocking ! does the throttle link return fully to the tickover position ? or possibly the crank seals have worn letting air in !

the oil injection unit on these skis can fail to test you will need to empty gas tank disconnect oil feed line to inlet manifold
then make a mix of two stroke fuel to the correct ratio say 10 liters. poor in to tank and take ski for a run say 10 minutes let it rest and run again if problem persists

it is possible you have leaking or blown crank case seals you will most likely need a professional to test for
i have provided you a link for free shop manual

vs.A powerboat is the type of boat you traditionally think of as a motorboat or speedboat. Imagine a water skier behind it. A jet ski is a personal watercraft for 1-4 people. The passangers sit on top of a jet ski with their legs on either side.

If you plan to store a jet ski in a garage, you will need to make sure it is dry and cool and with limited exposure to the sun. In general, you need to do what you can to prevent rust and other grime that eventually may cause mechanical issues.

Washing your jet ski is also needed after every use. You can use your car wash products. I also suggest to read the user's manual, it may include tips about maintaining your jet ski.

You can protect the engine with a special spray and water repellant.

If you plan to store your jet ski for a while, it is preferred that you will disconnect the battery.

You will have to pull the engine out and rebuild the top end. You will probably have to bore the cylinders. Purchase a piston kit that comes with gaskets and seals. Reseal the crankshaft with the new seals and your motor should be good for another 23 years.

On a machine that old it is always in your best interest to pull the motor and replace the crank seals and engine gaskets. Drop the jet pump and replace the seals, bearings, and impeller (if it shows damage). Make sure all the tubes are clear of sand and rocks. Inspect the drive shaft hull seal when motor is out. You will probably find that the exhaust rubber tubes (inner in particular) are cracked and need replacing. Put the time into your new boat and you should get 15 more trouble free years out of it.

If the seal is in the jet pump, get an impellor tool and replace all the seals and bearings in the jet pump. You will have to pull the engine to replace the crankcase seals or the rear hull seal.

Jet ski's do not have an adjustment on the oil pumps unless they are cable operated. Most just run off the end of the crankshaft. If the machine sits for a while and the oil pump seal is leaking. Oil will collect in the crankcase and take a few minutes of running to clear out. You can live with this, replace the pump, or block off the pump and pre-mix. A popular, cheap solution but a pain when it comes to refueling. As for the lack of power you probably have water corrosion in your carburetor nothing a simple cleaning won't cure.