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Smoking outboard 1998 mercury 6 hp 2 stroke. Fuel/oil mix is 100 to 1, the engine smokes bad in all throttle ranges. Is the fuel mix wrong or are the rings bad ? thanks

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Sounds like your running a bit rich. Try leaning down your air/fuel ratio.

Posted on Aug 23, 2009


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need the year of manufacture as some 2 stroke units have oil injection that automatically mixes the oil in the correct ratio for engine rpms otherwise it is 50:1 ( 50 parts fuel to 1 part oil)
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Does this engine require mix gas?

you are too short on details like make model , 2 stroke or 4 stroke
read your user manual or look on the petrol cap as most have the ratio on the bowser emblem
so for an answer, it is most likely a 2 stroke and so-- yes-- it will require a oil/fuel mix in the tank
if you do not know it , start with a ratio of 40:1 ( 40 fuel -1 oil) and only use 2 stroke oil not normal engine oil
run at rpms and there should be a trace of blue smoke
too much smoke cut the oil back to 50:1 and no smoke increase the oil to 30:1
go google and type in user manual for ( make and model ) --and the ratio will be in that print put

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I looked at the manual located at:

According to this manual you have a two stroke engine. Two stroke oil is mixed with gasoline.

From Wikipedia:
Two-stroke oil (also referred to as two-cycle oil, 2-cycle oil, 2T oil or 2-stroke oil) is an engine oil intended for use in crankcase compression two-stroke engines.
Unlike four-cycle engines which have a closed crankcase, these lightweight engines use the crankcase as part of the induction tract, and therefore, oil must be mixed with gasoline to be distributed throughout the engine for lubrication. The resultant mix is referred to aspetroil.[1] The two-stroke oil is ultimately burned along with the fuel as a total-loss oiling system. This results in increased exhaust emissions, sometimes with blue smoke and/or a distinctive odor.

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Cheers, Timo.

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