I have a 1994 Polaris jet ski slt 750 that will start up when it's out of the water but when I put it in the water it won't start. It just started doing this. I had the battery checked and was told it was fine. please help me

It is fairly easy to change your starter bendix. Just start by disconnecting the battery cables. Then you will remove the bolts on the flywheel cover, which also hold the starter in place, and then just change the old part out with the new one.

Try using a jumper from the battery directly to the starter, bypassing the switch. You may have a bad starter switch.

clean impellor and water intake ! run up on hose and check cooling ok !

Try this:

http://www.polaris.com/en-us/company/help

Fuses in the electrical box?

compression check , 100psi or more ! battery and connections good ?

You could have a sort circuit, somewhere

sounds like you hydro locked it and possibly blew out a reed in your engine intake or worse, you may have bent a crank rod. But before you go tearing it apart make sure all the water is out of motor and theres none in the fuel tank then put in a new set of plugs and see what happens,

Tools(1) A compression gauge (2) a spark gap tester.(3) A Clymer service manual for your engine. (you can purchase from your local dealer. I know all these are expensive but if your going to be a polaris tech you will always need them. Troubleshooting (1) check compression. Look at your Clymer manual for specific psi.all cylinders need to be over 100 lbs and equal each other within 5 lbs.(2) check spark. use a spark gap tester all cylinders should jump a half inch gap. if you have good compression and good spark, fuel is the problem nine
times out of ten.Ethanol gas is proven to stay stable in fuel systems for only 30 days in 90 + degree heat. Drain gas tank,clean fuel lines replace and replace all fuel filters. Polaris has a gravity filter under seat, clean it. Finally replace spark plugs, I know spark plugs probably don't look bad but this is a C.D.ignition. Fresh spark plugs means less resistance for the ignition system. The ignition system is week compared to automotive. Test drive polaris, if the problem is still there then there is further steps to take. If your polaris is fuel injected. Pull out your clymer manual. what is great about the Clymer Manual for Novice techs is it gives detailed info on your polaris. Troubleshooting tips and teaches you how your polaris works. If its carburetor then you should clean carburetors. Inside the carbs is another filter that needs to be cleaned. Its not difficult you just make sure you put everything back in proper order. take pictures if you need to.

first have you done what is necessary for that such as draining the oil (unless it's a two stroke) draining the gas and refiling it with fresh gas and a couple bottles of gas line antifreeze (it sucks up water) ... for the electrical parts ... spray them with wd40... that will force out any moisture at all and oil does not conduct electricity.