8hp suzuki dt8c 00802-581288. Bought the motor w/ the boat used fired it up at home in the can and no water out the discharge hole? replaced the waterpump cause thought it was bad, even though it was fine. Then I found out it has a thermostat, so I replaced that, the old one had tones of corrosion, still no water out the pee hole, is there anything I can pour down the thermostat hole to free corrosion? or should I go another direction? please help.