HELP......I have a 1989 Mariner on my bass boat. The motor is starting but idling rough. There is a large amount of smoke (2 stroke oil)coming from the exhaust when starting the motor. When the motor is put into gear it usually stalls. When it does run, it is extremly sluggish and will only go about 10 miles per hour. This problem occured after storing the boat for about 10 months without starting it..........if you feel you know what my problem is PLEASE RESPOND. I have checked all (four) spark plugs and they look ok. THANKS FOR YOUR TIME.
If you did not start out with fresh gas, I suggest that you drain your tank and purge all the old fuel from the lines and fuel pump. Drain the float chamber in your carbs and try with fresh fuel and use a "name" brand of oil. If that dosen't get it I suspect that your carbs are crudded up and you may need to install new carb kits. Cleaning them so they look shiney won't get the crud out of the little internal passages.Howard
I agree with so little, carbs off and clean them. Snapperbait is right too. A new n fresh tank of juice would help too. don't forget another impellor , they are cheap enough Happy boating...
You will have to take the carbs off and apart and let soak overnight in a good carb cleaner, and as stated before get all the old gas out of the system, as in tank, fuel lines and all. If it has set this long with any gas in the carbs, then the small passageways have got varnish in them and just spraying them with carb cleaner will not do the trick. Save yourself some time and angry, and take them apart and clean them good. Just my .02 worth.
Does the engine sound normal and make revs easily on the trailer? (not that I want you to rev it unloaded on the trailer) mine would act normal and seem fine on the hose. try and get it on plane and no go. went through the fuel system (everything) did a compression test new plugs still no planeafter spending a bunch of time and money on carbs fuel pump diaphrams etc. I replaced the switch box......andpresto ran like a raped ape. give it a de-carb too
1989 Mariner 115 HP not running properly
, they are cheap enough 
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