I took my 76 Challenger out for the first time today. I have never driven a jet boat before. When I get it up on plane, about 25-30 mph, it starts to porpoise like crazy. it increases until the hull jumps right out of the water, slapping back down hard. I didn't have the balls to try and power through.
I have a hydraulic Place diverter, but it wasn't working today (loose connector). Is trimming these things that critical? Or is there something else I should look at?