carb vent and drain lines are it for sure, but there is also another small mod that makes sense. the crankcase breather line. That square foam filter in the airbox is the one and it runs straight down to the crank. now i know it's just a breather line but with enough water it can force itself down that tube. to prevent this you can run a 1/2" tube up and around the carb. this forces any water to go up before it goes down. i've doen this a few months ago and everything runs great. no swamp outs at all. there are some directions to do this on triangleatv.com, but just make sure its all tucked away and off of the exhaust. good luck