660 sputtering in water cant figure it out need some help

[MYAMAHA]

its a 2003 660 grizzly when i go in some water over the recoil in high it will sputter out but if a keep it reved up its fine in low it works good. After the water on the road its fine but if you stop it will stall out as soon as you hit the trottle if you choke a bit you can coax it to rev up. Its very strange i checked everything and it not steam because i took the seat off and side panels. I hope you guys can give me some ideas ive looked at everything and cant fiqure it out and love deep water. Also i have the pilot jet one size bigger and the main two sizes and a k&n filter.

 

[MrSled]

Check to make sure the plug boot is seated all the way and spray silicone spray around coil and plug.

 

[MYAMAHA]

Check to make sure the plug boot is seated all the way and spray silicone spray around coil and plug.

ok ill try doing that, do these quads usually work good in deep water

 

[MrSled]

If set up right they work fairly well.