650sx bogging issues

Ive got an 88 650sx, just threw a team butch pipe and water box on it, I am dealing with a bogging/loading up issue with my ski, it runs great for about 20 minutes or so, then it boggs like piss and wont get on plane, take it out of the water and run it and its good for another 20 minutes, Could too much water getting into the pipe be causing problems? or maybe the manifold gasket it is leaking internally, I run klotz super techniplate at 32 to 1, Stock 28mm carb, also just threw on a 9/17 skat trak prop. any suggestions?
 
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