I got antsy waiting for a used Yamaha 8hp outboard to appear, and jumped on what seemed like a deal on a Honda BFD9.9. Test run without water. I never should have done that. Turns out it won't pee water out the cooling system indicator. I replaced the water pump impeller. The old one was definitely trashed. But it still isn't moving water, being tested with a hose and muffs over the lower unit intakes, (which I cleaned). What do you think should be my next move? Replace the thermostat? Try running it in a tank or in real water first (no muffs)?