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Author Topic:   2006 Merc four stroke runs rough
floater88 posted 08-12-2015 03:59 PM ET (US)   Profile for floater88   Send Email to floater88  
My 2006 Merc kicker 15 hp four stroke started running rough as of late. Starts to stumble and then dies. Fires right back up again though. I've changed the fuel filter, plugs and hose and bulb to no avail. I've read that these motors have their carbs set too lean from factory. One post I read sais that there is a fuel/air screw, under a bronze cap that you can drill out, to adjust to make it run better. Would anyone know where this bronze cap would be on the carb? Before I take it all apart i'd like to get a picture of where this part may be. Thanks
dg22 posted 08-13-2015 11:36 AM ET (US)     Profile for dg22  Send Email to dg22     
Since this is a recent problem, I would start by cleaning the carb. Remove the main jet and spray out the pilot hole in the main jet with carb cleaner. Sometimes that main jet can get gummed up. Spray out all areas of the carb.
weekendwarrior posted 08-13-2015 12:04 PM ET (US)     Profile for weekendwarrior  Send Email to weekendwarrior     
I agree, most likely a carburetor that needs cleaning. 4 strokes have tiny passages for fuel, and this combined with today's ethanol gas that gums up quickly results in plugged up carburetors more often than in the past. Using fuel stabilizer in every tank will help.
floater88 posted 08-13-2015 04:22 PM ET (US)     Profile for floater88  Send Email to floater88     
Thanks guys. Will try that and see.
rtk posted 08-14-2015 08:54 AM ET (US)     Profile for rtk  Send Email to rtk     
I had to have the carburetor cleaned fairly often on my 2005 Mercury 9.9 ProKicker. I have been told the jets are so small on these lean running small four stroke engines that they are prone to "gumming up".

A good cleaning in the ultrasonic cleaner at the dealer and a carb kit solved the problem. It wasn't expensive- $100 - $150 or so.

It was recommended that I run the engine dry of gasoline after use. I have sold the boat so I didn't have the chance to try this on a long term basis. I think a lot of my problem was caused by lack of use of the engine. Even though the fuel was treated it still wouldn't keep well in this engine.


weekendwarrior posted 08-14-2015 11:03 AM ET (US)     Profile for weekendwarrior  Send Email to weekendwarrior     
If it hasn't been clogged for an extended period, just shooting some carb cleaner through the passages usually dissolves it almost instantly. Alternate carb cleaner and compressed air a few times and your usually good as new.

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