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  1. D

    1973 mercury 850 carb adjustment

    I finally have most of the bugs out of this unit after it sat for a few years. Compression 115 on all 4 cyl. Now at fine tuning stage its running consistently decent in water. Not leaking any fuel after needle / seat replacement BUT not seeming to get full rpm's - running rich. Upper carb was...
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    Mid-seventies Mercury 850 won't turn over with plugs in

    Hi, this just got this unit after sitting for 2 years. The friend who owned it last says it ran perfect last time he had it out and he did nothing to modify timing, etc since then. It has decent compression (over 100 in all 4 cylinders) I first removed spark plugs, sprayed lube in cylinders...
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    Mercury 850 ID problem

    Hi, I have a mid-seventies Merc 850 but am having trouble identifying by serial number. It is 7017210. If anyone could help with reference it would be appreciated.
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