Was just out for a three day weekend trip. Went through lots of water and mud, and the last day I thought I had a fuel leak or forgot to fill the gas tank. Bike acted like it was running out of gas and when I choked it and went to reserve, it started and ran okay. When I got home, I power washed it and then ran it to dry it out. It would not accelerate and then died. When I took the tank and fender off for access to the air filter, it had a lot of mud and water in it! Took out air filter and the airbox had a good puddle in it. Took off carb, and it had muddy water throughout. DEFINITELY recommend checking air filter evry day and bringing a spare with you. I saw a in a post that a triangle of silicone recommended to be applied to rear fender to deflect mud/water from getting to the top of the airbox. I strongly recommend this as well, and don't blast the pressure washer up the rear fender from the back of the bike. Your riding conditions can certainly affect how contaminated your air filter gets.