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I currently have a 300 fourtrax that is snorkeled . It is all ran properly with new hose and tubing but my carb is still getting water in it somewhere when it get around the bottom of the seat or so . Got a vent line running out the side of the carb for it to breath and then drain tube is plugged up but it still dies underwater . But I can pull it out of the water and start it right back up without draining the carb or aorbow or anything . Please help I don't know what else to do with it .
 

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it sounds to me you are getting wet electrically , most common problem is the spark plug boot , do you have dielectric grease on it , both where the wire screws into the boot and where the tip of the spark plug slides in , second thing would be the coil getting wet --------- instead of plugging the drain hose , you should have a check valve on that hose ------ try sealing the top of your air box , some use heavy grease , I use clear aquarium silicone on the cover , you can still get it off and it cleans up easy when I have to redo it
 

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a very little bit is normal , but not a lot , blow-by from the rings cause it to be excessive ------so I take it that when the bike hits the water deep it kills , as soon as it is out the water it starts up , that has to be electrical , I like to start with the easiest things first , unscrew the boot off the wire , if the end is messed up looking , then cut just no more than 1/4 inch off the end , apply the grease and screw it back together , also a plug can get a crack and foul out with the water , try a new plug , apply grease to the inside the boot ------- on my 4x4 trucks I use to spray women hair spray on the distributor cap , wires and boots and it worked wonders , try and spray the coil , wire and boot to water proof it
 

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to get to the ignition coil , you take the tank off , and it is on the left side the frame right in front of the tank , the spark plug wire goes to it , they will get a crack in them ----------- spray the entire bike with a garden hose and see if you can get it to kill and it may direct you in the area of the problem
 
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