You need to start at the simple stuff. Check the spark plugs and see if they are wet with gas. If not, could be a fuel pump issue. See if the plugs are fouled, change them and check for spark. If you have both, it should at least sputter. Check for water in the fuel.
SOURCE: 06 kawasaki jet ski wont start
Check the fuses! I have two 900zxi's brand new batteries and brand new plugs,
Fuses are in the electrical box under a black cap(depending on model)
SOURCE: Overheating YAMAHA XLT 1200 jet ski
you may have something clogged in a water passage but more than likley u have a bad sensor the sensor is located on the main exhuast if you go on the right side of the ski and look in the engine compartment it will be located at 9 oclock u will see it sticking out of the exhuast with one wire comming out after u run the ski and the buzzer goes off pull the seat and see if the engine is really hot if u can not touch it will be hot but it has to be very hot for the sensor to pick it up if u can touch the motor and exhuast it is a bad sensor
SOURCE: how to replace seal on a jet ski
The seals in the drive pump can be replaced by taking off the ride plate and pump housing. To replace any other seals (engine or hull) you will have to remove the motor from the hull.
SOURCE: how to replace seal on a jet ski
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.
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.
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