problem is water in cylinder#3. pulled head, changed gasket, head is not warped. 90 psi all cylinders. start it and #3 cylinder still has water. my nephew borrowed boat and thats when my problem started (go figure) when i first ran it after gasket replacement it had dirty water coming out of prop/exhaust. is it possible exhaust gasket on powerhead is bad . i have the clymers manual but its not much help with this problem