I have a 2002 Mercury 115 hp, 2+2, 2 stroke outboard. After putting premium gas and iridiums in my small mowers (along with my regularly added Sea Foam) after your suggestion worked so well I thought I'd try them in my outboard since the lower 2 cylinders don't generate power at low rpms and as a result the plugs, although firing, aren't causing the cylinders to come up to the temperature required to burn off contaminants on the plug insulators.
Pulled up my NGK catalog, and somewhere around page 268 (recollecting) I got into the "IX" (Iridium) plugs section and cross referenced my OEM recommended plugs to IX. In the process I decided to go to a hotter plug too so I dropped down from 8 to 6 on the heat range. I was already using 91 octane gasoline as fuel so I didn't need to change that....engine is rated for 87 octane minimum but with 20-22* BTDC at WOT, pre-ignition could be a problem anyway so I already had that addressed.
Water testing revealed starts faster than you could operate the key switch and contrary to reports of rough idling with these engines, with the engine tilted up slightly so that any un-ignited fuel wouldn't puddle in spark plug area, idling around in the no-wake zone and all, you could have placed a full glass of water on the engine and not spilled a drop.
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Today's Featured Article - Museum Coverage: The Stuttgart Agricultural Museum - by Cindy Ladage. While cold wind was blowing back in Illinois, in Arkansas, daffodils were in bloom, and the Magnolia trees were adorned with fragrant blossoms. Stuttgart, Arkansas was the site of this year's winter Minneapolis Moline Collector's show February 25-27, 1999. The show was held at the Oliver Museum created by Don Oliver, the pioneer of the four wheel drive tractor. Oliver along with Gale Stroh and Kenneth Bull using Minneapolis Moline tractors and parts created what has become known as
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