Super Jet Runaway motor

So I was going to go riding today and started my ski before loading it in the truck and it took off. Been doing some reading and sound like I have a leak somewhere. The only thing I have changed was the domes and that was like 2 months ago and it has been running great. Is there anything I can check before going and buying all the parts for a leak down tester. Only thing that happened that maybe did something was it went upside down the other day and stayed running. And with the one way valve it filled up with quite a bit of water. It took me a while to start back up but once it did, it ran fine the rest of the ride.
 
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