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I have a Mercury 200HP Outboard Blackmax Offshore 1991. There is a threaded hole at the base of the block. See picture. Exhaust comes out of here. What’s suppose to be here??
There was a pressure fitting that mounts in threaded hole to supply air pressure to boat side oil tank. Plug it off as it can cause cylinder to run lean and a fire under cowling.
I have another question. This threaded hole on the head is also opened. The other head has a value on it with a hose. Should something be here or can it remain unused?
