I have a 99 polaris trailblazer 250 that we we are having a stalling problem when the quid goes threw water. I looked it over and can not find issue. We had it out over week end went through some water and quad lost power . When at home I ran the quad with the hose on it and it ran fine.

 

Welcome to the forum! Pop the front panel and clean all electrical connections, to cdi,coil,etc and use dielectric grease to help water proof also.Check for any nicks on the plug wire which could cause it to ground out and die in water and use dielectric grease in the plug cap also. Electronics don't like water. Plus not a bad idea to pull the recoil cover and clean around the stator and flywheel area and seal the recoil cover with rtv silicone. OPT