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

[51seahorsetn27]

I’d go thru the wiring since it is known bad, another guy had a similar problem and it was a grounding issue with bad wiring and a broken switch, do all the wiring/ switch stuff dont skimp here. If problem persists check fuel issues. Vapor from the carb is usually unburt or over fueled cylinder from no spark so go to wiring freshin it up, then if still problem check ignition modules and or box(s). Compression sounds good, if all is well there then go to fuel pump then carb. 10 years as a mechanic says look for a ground short in bad wiring.