So I was fishing Lock and Dam 25 this past Saturday and something happened to my motor. I am stumped by it, so I will ask you all.... After fishing all day, I was running back south down the Miss river. I had the motor up to full throttle for about 2 miles and was going as fast as I ever have in that boat (46 mph with the current helping me along a bit). As I went, the motor suddenly changed sounds. It went from its normal humming sound, to what sounded like it was under a load, and did not have the torque to keep up. For 3 seconds as I slowed from 47 to a stop, it sounded like the motor was burning coal. As soon as I came to a halt, it stalled out. I tried the ignition, and the starter (not the motor under its own power) turned the cylinders over (reluctantly and again sounding like it was under a load - like the batteries were almost dead or something) for two revolutions before ceasing to turn over. I tried the keys again and it would not turn over. I decided that I ran the batteries dry or that I had certainly seized the engine up. Time to trouble shoot. Here is what I did: 1)After lifting the motor with my tilt (yes it is on the same battery as the starter, so I found it was not a electricity issue) , I examined the problem thinking a rope had locked up the prop. I was sad to see no rope or line, because it could be much worse. 2) I then looked at the oil (it is a 2 stroke). Plenty of oil in the reservoir (thank god!). 3) I then looked at the water coolant intake, no plugs (again thank God). I can say that it was shooting out a nice stream of water an hour before, because I usually look a few times when I fish a long day. After all the looking, I put the motor back in the water, and it started up reluctantly, but ran! It idled hard at first, so I put it in gear and drove slowly (20 mph) for the remaining 4 miles to get to the dock. By the time I got to my launch, the motor was running just fine, except I could hear a pulsing squeak as it idled. Coming home that night, I pulled the plugs. They were used, but not fouled. I then changed the lower unit oil. It looked used, but it was not dry and there were no splinters of steel in the magnet. I still have yet to check the fuel filter for water, but I could not imagine this was the problem as my attempt to restart the engine was such that I could not get the motor to turn over at all (water in fuel would let it turn over, but not fire up). Any ideas for you who tinker with your own motor.