I have a 1989 Yamaha 200 2 stroke. I have replaced the water pump and housing because there want any water coming out of the piss hole.Now the only way to get water to come out of the piss hole is to hold the ears tightly to the lower unit. Once water starts to come out its fine but if I shut the engine off and wait a few minutes, it wont pickup on its own. I have put a hose on the tube that goes into the top of the water pump and water comes out fine so I think everything is ok in the top end. Any ideas? What am I missing?