I went riding this past weekend and although I was not in water over the wheels, I was in large mud holes and puddles most of the 5 hours we rode. Towards the end of the day and especially when I went through shallow puddles, my 450 would sputter, backfire and lose a significant amount of power. In fact it wouldn't go over about 27 mph. When I shifted, it seemed to lose even more power. Could this just be water in the fuel or a bigger problem? I looked in my airbox when we got it home and it looked dry, however the air filter was very dirty. I checked the oil and did not see any water in it. Got a big trip planned this weekend so I need advice as to whether I can repair this in my garage or whether I need to take it to Honda. Finally, does the gas tank have a drain and where is it located. Thank you in advance for any advice!