2011 Kawasaki Ultra Lx Horsepower

2011 Kawasaki Ultra Lx Horsepower

07-17-2017,12:14 PM #1

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Kawasaki Ultra LX (NON SC) Water getting into engine

Hey Guys-

Stumped on this one.
Ski will run great all day long as long as you DONT shut it off. Good top speed, good holeshot, clean oil.
Once you shut the ski off, wait 15 seconds, itll start back up again.
If you let it sit in the water lets say an hour or two, itll crank quick for 1-2 rotations, and then slow down and stop, HYDROLOCK!
It would almost seem as if the motor is sucking the water into the motor from the exhaust, hence why it cranks quick, and then slows down?

I have tried to replace exhaust gaskets, as it had a mark in it, same result.
I read the second waterbox adds too much pressure keeps too much water in exhaust and can cause this, So I put a RIVA free flow kit on it. Same Result.
Tried to disconnect the header from the head, ran ski for a second in water, shut it off and let it sit for a few hours, it started back up again(No water) This told me that the exhaust was the problem, and not a cracked head or block, if it was a cracked head or block it would have hydrolocked with the exhaust disconnected. So being I figured it was in the exhaust,
Tried to replace entire exhaust and waterbox with a used set up from a buddies ski, same result. Runs great, shut off wait hour or two it hydrolocks.

I am really stumped here on this one.
Things I noticed were those "Rings" on the exhaust end are non existent, but as far as I can tell, those just seal off the exhaust, so if I had an exhaust leak, that would be my culprit. Correct me if I am wrong but that should have no bearing on back flowing.

What on earth would cause one of these to literally hydrolock while floating, not running, and not moving?!?!

Thanks guys, any help is appreciated.

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2011 Kawasaki Ultra Lx Horsepower

Source: http://greenhulk.net/forums/showthread.php?t=263470