Re: Mercury 650 problems – is it worth an overhaul?

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June 20, 2018 at 3:46 pm #78212
seakaye12
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    Yes you can drop the lower unit w/o draining the oil. It is all sealed to keep the oil in (and water out!)

    No need to remove the propeller that I can think of.

    I got my wiring harness from CDI Electronics. I would suggest that you first go to a site like marineengine.com and retrieve the part number for the original Mercury wiring harness. You will look up your motor by serial number. You HAVE to have the serial number. Once you have the original Mercury part number (it might be 84-60795 but verify that first) then you can contact CDI and see if they can help. Other sites like Oldmercs.com might also be a source.

    Seloc manuals are of little value; I agree.

    I use a Teleflex brand tachometer