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The improved throttle response, superior anti-fouling, and high ignitability make this NGK Iridium Spark Plug upgrade ideal for Mercury, OMC, and Yamaha 2-stroke outboards with ADI/CDI ignition systems, and who are performance boaters, river runners, drag, and F1 tunnel boat racers.


Better Ignition The smaller iridium center electrode of the plug offers a stronger and more concentrated spark, allowing quicker combustion. These plugs have superior ignitability and require less voltage from the ignition coil, leading to fewer misfires.


Enhanced DurabilityIridium is much harder and stronger than platinum, making it more durable to withstand the high voltage coming through the spark plug wire.


Extended LifespanIridium plugs have the longest lifespan compared to a standard spark plug or platinum plug.


Short Reach: 1/2" fits OEM cylinder heads

Socket Size: 13/16" uses standard large spark plug wrench


If your spark plug gap is too small, the spark will be weak and the engine will run poorly. If the gap is too large, the ignition system may not have enough voltage to spark across the gap or turbulence in the combustion chamber may blow out the spark. This can cause misfires.


Additionally, spark plug tips can be damaged and j-gaps weakened by adjusting the gap incorrectly, so we pre-gapped these spark plugs for you.


Example fits include but are not limited to Mercury 150, 175, 200, 225 Pro Max, 260 ROS, 280 HP, 300 Drag, S3000, SST-120, SST-140, Black Max, SportJet 190, 210, 240, 2.0 Liter, 2.4L, 2.5-Liter; OMC SST-45, V6, V8; Yamaha 3-cylinder, V6.


Includes a set of six (6) pre-gapped NGK Iridium Spark Plugs with two (2) Buckshot Racing #77 decals. Or simply select the number of spark plugs you want and the price will adjust.


Contact Mike Hill at

NGK Iridium Spark Plugs (2-stroke upgrade)

SKU: IX-77
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