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getting a used engine to run right

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I've got a 7.5 mercury that when i first got ran great but smoked a little more then i felt was normal, but i was told that the engine had been sitting for quite some time and i know from personal experience that sometimes engines will smoke for a while if they haven't been run in a long time so i wasn't concerned about it when i purchased this motor. I let it sit for a while myself and when I went to use it, it would hardly start and then if it would start i couldn't get it to idle correctly at all plus it still smokes pretty bad. So my question is since I don't really know much about outboard engines (I've only worked on dirt bikes and lawn mowers) what are all the things I should do to get it in proper order to try to diagnose what's wrong with it. I know if I was working on a lawn mower I'd change the oil, filters, transmission fluid.. things along those lines but I haven't a clue where to begin with an outboard.
Jeremiah

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Re: getting a used engine to run right - Coastman 15:31:01 02/01/05 (0)
Sounds like fouled plugs, or thereabouts. You are on the right track. I use fuel stabilizer year 'round. Really seems to help, particularly after sitting up for a couple of weeks (months).
Re: getting a used engine to run right - fishindude 20:01:32 07/24/04 (2)
Start by removing the carb, clean it really good, then rebuild it. Put in a new sparkplug, check/clean the points.
The smoking may be from to much oil in the mix. Or the piston rings may be bad.
- Re: getting a used engine to run right - Loweboy 17:58:17 07/29/04 (1)
  Smoke from a two cycle always means too much oil in the mixture or the carburator is running too rich. The fuel goes into the crankcase of a two cycle engine before going up through the ports in the cylinder walls to be ignighted. The oil in the fuel lubricates all the moving parts including the crank and rod bearings. Poor or worn rings just means less compression in the cylinder and vacuum in the crankcase. Lean the carburator out but first get the mixture right for the motor.
  - Re: getting a used engine to run right - papasage 17:14:26 08/22/04 (0)
    first git a manul it is like a 2 cycle dirt bike just water cooled . you say you have worked on dirt bikes ? just think of it as the same basikley . papasage

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