Took a trip down by the river this weekend and drove my 85 KLT 160 into a deep hole. Water came up to about the gas tank. The intake was above the water but the exhaust wasn't. It finally died before I could get it out. I think some water got into the exhaust. It wouldn't start so we pulled it for a while. It kept trying to start, but wouldn't stay running. I finally got it to run on full choke but everytime I gave it throttle, it would die. I let it run at idle for a while and it eventually ran fine like before. Any ideas on what went wrong, besides driving into the hole? Anything I can do to prevent water issues again?