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Hi and thank you for your question.
If you got or are getting water in the cylinders, it is not going to start.
My suggestion is to attempt to crank the engine with the spark plugs out and pump as much water out of the engine as you can. Make sure your spark plugs are dry on the tips then reinstall them and attempt to start. Typically it is going to take several attempts to get it to the point where it will actually run and idle. I would expect it to start and run a short time then quit. Remove the plugs again and dry them, and put them back in and start it again. You do not need to put it on the flush hose until it gets to the point of running more than 10 seconds on its own.
My question is where did the water come from? Did the ski get swamped? Did someone turn the water on in the flush kit before the engine was started? Hopefully it is not something serious. At this point, human error would be the better answer because mechanical problems can get expensive to repair.
If you have any more questions, feel free to ask.
Excellent. Very glad to hear it! Let me know if you have any more questions. You can just keep adding on here if you need to.
Thank you for the kind words.