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    What is the hose/tube for?

    I have a 1988 Yamaha 70ETLG and while changing the water pump, I broke the fitting on the lower unit-forward that connects to the thin hose that goes up. I followed it up and it turns out that it isn't connected to anything on my boat. What is this tube for and can I do without it?
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    Fresh Water Hydrolock Volvo 8.1

    I've been through this with my carberated OMC but a friend of mine couldn't wait for me to change his risers on one of his 2005 Volvo 8.1's. He took the riser off, sprayed fresh water down into the exhaust manifold (obviously not knowing what he was doing) and now it's hydrolocked. After...
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