Super Jet water in my motor??

Been having the same problem for a while and cant figure it out. I got a stock 701 with a ADA girtled head and sizzler pipe. ski funs great out of water, funs fine on the hose, but soon as i put it in water it will fun poorly for about about 30sec and die. pull the plugs, there soaked, cylinder is full of chocolate milk. let it sit for a while out of water and it will clear up and fun fine again. i pulled the head, saw nothing, put new orings on it and put silicone on the o-rings just to be sure and same problem. I pulled the cylinder off today and saw nothing except for some real light rust on the botton of the cylinders.
Any suggestions would be great! thanks
 
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