Copilottruman Posted March 25, 2019 Share Posted March 25, 2019 Purchased a 2005 mercury 125 saltwater (2+2) last year. Ran it fine a couple times last year no issues. However this year since I have no real history on the engine I’d like to replace “everything” for some peace of mind. So my question to you guys. Besides fuel filter, water pump, thermostat, plugs. What would you guys replace on this engine if you didn’t have hours or history on it. Compression on the cylinders are all well within spec. I’d like to clean all the carbs out and possibly re sync them but I’m not sure how hard that would be. Local mechanic said this type of work would be an easy grand. No thanks. Or if you have a reasonable mechanic in west Michigan that’d be another option. Sent from my iPhone using Great Lakes Fisherman Mobile App Link to comment Share on other sites More sharing options...
EdB Posted March 26, 2019 Share Posted March 26, 2019 If it has a water pump impeller, I would replace that. Link to comment Share on other sites More sharing options...
Matt Posted March 27, 2019 Share Posted March 27, 2019 I have the same engine. Fuel filter, lower unit oil, impeller pump, plugs. Once that’s all changed and it runs good leave it alone. That’s my maintenance schedule and mine runs great every year. Had mine 9 years now and only thing I had to fix was a 175$ coil. Good luck. 1 Link to comment Share on other sites More sharing options...
Copilottruman Posted March 27, 2019 Author Share Posted March 27, 2019 When you did the pump replacement. Did you do the $120 kit that has that base plate or just the simple one with the gasket and impeller? Also on the diagrams I’m seeing two filters on this engine? Sent from my iPhone using Great Lakes Fisherman Mobile App Link to comment Share on other sites More sharing options...
Matt Posted March 28, 2019 Share Posted March 28, 2019 On the impeller be sure to replace the base for plate. The plate sometimes will wear befor the rubber pump does. Especially if it ever gets sand or debris in it. I have had one fail just from a worn base plate. Be sure to clean any rubber streaks with brake cleaner befor reassembling. Grease fins up and you should be all set. Just get the whole kit and you should be worry free. That price seems a bit high. I only have replaced the feul filter that's visible on the side of the engine. 1 Link to comment Share on other sites More sharing options...
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