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

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mercuryspecialist


Replies: 82
Topics: 9
#77140

Hello,
Personally, I very long ago tired of reading of how these 50 cubic models are supposedly a poor choice. We sold a pretty fair quantity of them, and they were not problematic to us. The 1976 year model brought a distributor-less ignition (also true for 4-cylinder models), and stainless lower unit shafts. Capacitor discharge ignition should not be having spark plug fowling issues, but may have carburetor(s) or fuel pump issue, or be mis-adjusted. Mercury wiring issues are a fact, but 25 years to somewhat more, is often the limit. You should open the remote control, and address any rotten wiring inside as well. The use of premium grade fuel would not be an issue. Like most all outboards, do not run it out of the water, replace the impeller every few years, check/change the lower unit lubricant, prop correctly for the boat, and mount the outboard correctly (you might be surprised at how many outboards are incorrectly mounted). A lower unit ratio change would be needed for a heavy or large boat (again, it is a 65 flywheel rated horsepower with 50 cubic inch displacement outboard motor, not a noticeably larger outboard). A few questions, or if some advice is wanted: info@fergusonpoolemarine.com

Regards,
Joe