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Boating Discussion Thread, Excessive Smoke Mecury 200 EFI's in Boats; I have a pair of 1998 Mercury EFI 200’s. I have owned these engines for three years now. This season, ...
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Old Oct-12-2009, 02:57 PM   #1
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Excessive Smoke Mecury 200 EFI's

I have a pair of 1998 Mercury EFI 200’s. I have owned these engines for three years now. This season, the engines appear to have excessive smoke over the past two seasons. The smoke is white/gray hard to pick one color over the other. However, it is to the point now where starting the engines cold there is an abundance of smoke that will subside to a lesser amount after warm up. But even the lesser amount is embarrassing at the docks. When cruising at 3100rpms I don’t see that much smoke but when stopping or idling that is when you smell/see abundance. What can I check for resolution to this problem? I utilize the Quicksilver 2-Stroke Premium Oil, I use Quickleen every other fill up. Any suggestions are much appreciated.
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Old Oct-12-2009, 06:44 PM   #2
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Are your oil pumps original? do you service your fuel pumps regularly? is there any signs of water entry on your spark plugs, you need to be shown what to look for it wont be water (if it is thats bad).
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Old Oct-12-2009, 07:49 PM   #3
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sounds like plugs or lift pumps
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Old Oct-13-2009, 01:39 PM   #4
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mine always smoked a ton as well. try changing the plugs or even change the 2 stroke oil to a diff brand
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Old Oct-14-2009, 11:41 AM   #5
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Oil pumps are probably original. I do have the engines serviced every 100 hours. I will check the spark plugs and change them. I will look into new oil pumps as well and see if that corrects the problem. I have tried different oil, but have had other problems occur with doing that. Thanks for the advice.
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