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  1. C

    650 Merc. Top piston's crown disolving

    My 1975 65hp. merc started fouling the upper plug.<br />It appeared to be aluminum. After tearing the powerhead down, the crown of the top piston was wearing away. The cylinders look perfect. There is no evidence of overheating and it has a new water pump with lots of pressure. There is no...
  2. C

    1975, 650 merc water in lower unit

    I've been getting some water in the lower unit.<br />It's not separating out but making the oil creamy.<br />Any best guess on where it's coming from?<br /><br /> thanks.
  3. C

    650 merc battery hooked up backward

    Some un-named family member hooked up our battery backwards and tried to start it for the first time this year. It now does not appear to have any spark. The rectifier appears to not be working. Any ideas as to wht other damage there may be?<br /> thanks.
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