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Boat Repair/115Mercury idle and 2+2 transition

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Expert: Jeff Grigg - 2/5/2008


Question
2005 Merc 115.Carbureted. 2 cyl at idle. 4 cyl above 2000RPM. I am interested in eliminating the 2+2 feature. Are there any modification kits available. The engine runs poorly during the transition and also idles poorly intermittently. Any know mods would be helpful.

Answer
Bill, I don't know of any modifications or way to convert the engine. While they can be problematic quite often there is another reason for the engine to run rough and if it is not up to snuff, then the 2+2 makes it worse.
Check your compression, spark plug condition and try running a little Power Tune through the engine. If you are doing your own work make sure you follow the directions in the service manual exactly.
Jeff

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Jeff Grigg

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Can help with most any question related to outboards, high performance, hull repair, rigging, if it floats and uses a motor. From a 9.9 on a aluminum boat to DFI two strokes. Outboard motors are my specialty. I can help with some I/O questions as well. Ratings are the only way we know if we are helping. If you are pleased with the help, please rate us. 20% don't bother reading my answers! If you are not going to read the follow up then why ask? Keep in mind we do this at no charge and are not paid. We do it to help you!

Experience

32 years in the marine business. Own a service facility, in coastal South Carolina certified Master Tech by Johnson/Evinrude, certified Mercury/Force, Tohatsu/Nissan. Former technical director for DMI Pistons. 30 year racing career including 3 APBA Formula V National Championships

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AMTECH, APBA

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Boat & Motor Dealer, Car Classics, Custom Vans (tech articles), Miami News, powerboat racing column

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Certified Master Technician Johnson/Evinrude

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