I just replaced two pistons and a cylinder on my ski. When it is out of water it cranks right up and sounds fine, I can give it the gas and it sounds fine. The compression is reading 150 on both cylinders. When I put it in the water it does not seem to want to go anywhere, it sputters and cuts out, then is hard to start kinda like it is hydrolocked. When I take it back out of water is will start and sound okay. Any ideas???