ive got 2 maxijets with sureflow kits on them and every once and a while i get waterspouts from the surface to the power head and makes thousands of bubbles what does this?????
Just lucky I guess. Try playing with the angles and see if you can get it to stop. Koralias 4 will do this occasionally and then will go weeks without doing it again.
I also had that problem with the larger prop. When I changed to the medium flow propeller, everything worked great. I'm not sure how much flow is lost but even the mediums seem to move a lot of water.