seem to be having problems on my prairie 650. After submerging the motor in water i cant get it to run for more the 10 second without a 3 second power loss. I drained the fuel, cleaned the air filter, drained the float bowls, checked the fuel tank vents, and changed the oil. It idles perfectly, however when you give it any more than 1/4 throttle it will rev up just fine for about 10 seconds, then bog down to idle for about 3 second and continously do this over and over. It occasionally will backfire. Any one have any suggestions? Also could you tell me where the fuel filter is and how to check/clean it? I can't seem to find it. Is it in the tank? Thank you very much.