Kawasaki 650 SX standup JetSki cooling issue. Could a blown head gasket be the issue??? I need help!

I need help diagnosing an issue with cooling. All the coolant lines were ran correctly, but very little water is coming through the coolant lines. Something is stopping the water flow and I cannot find any blockages. Got any ideas?!? Kawasaki 650 SX standup JetSki cooling issue. Could a blown head gasket be the issue??? I need help! Also big thanks to Mark‪@EricksonMachinePerformance‬ for all the videos. He has been a huge help to me through this journey with 2 strokes. If you like working on your jet-ski give them a subscribe!