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8/26/2007
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CA
I have a 2016 KX450f that was completely submerged (I'm an idiot) when it had 4 hours on it. I got as much water out as I could and I had to ride it home which was about 15-20 min. I then did repeated oil changes until the oil came out with no water and cleaned it all up. Since then I've ridden it with no issues.
Fast forward to now and I have 10 hours on it and checked the valves. All 4 were outside spec on the tight side by about 2 hundredths. I've had them shimmed, but what other problems am I looking at? If the valves are shot would they be more out of spec than that? Should I be tearing it apart and having a look? The dealership advised to ride it a couple more hours and check the valves again but I'm paranoid about a catastrophic failure. Any advise?
Fast forward to now and I have 10 hours on it and checked the valves. All 4 were outside spec on the tight side by about 2 hundredths. I've had them shimmed, but what other problems am I looking at? If the valves are shot would they be more out of spec than that? Should I be tearing it apart and having a look? The dealership advised to ride it a couple more hours and check the valves again but I'm paranoid about a catastrophic failure. Any advise?
Now, water damage can rust out your bearings and crank. Thats where youre gonna see your motor blow up. The oil will probably mitigate this but id still do a top end and take a peek at your crank just in case. 10 hours its about time to do that anyways.
I've done a bunch of work of submerged jet skis. As long as you get the contaminated oil and moisture out they have always been fine. Change the oil so it is no longer milky and run it. When you shimmed the valves did you check the cam journals for scoring? If they were not harmed by the water contaminated oil then you are most likely fine. A small drop of water can make engine oil look like shit...it does not take much. Run it for a while and pull the valve cover to check everything. The valves being out of spec had nothing to do with water injestion...
The Shop
I'm hoping to avoid rust because after all the oil changes to get the water out I changed the oil filter, rode it and then changed everything again.
Edit: I see your question was more about the valve spec, I apologize. But FWIW as previously mentioned, water has nothing to do with valve spec
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