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The Rubicon and Rincon use a Ngk Iridium spark plug compared to a reg resistor type Ngk for the Foremans.I run the Rubicon plug in my 450ES all the time,they never foul out and make your ignition system work easier.The new Honda and Toyota cars run them from the factory and say not to replace them for 100,000 miles.The Iradium plug is twice as efficent as platinum tip spark plugs.The part number starts with IR which stands for Iridium type.The plug is perfect heat range for South and Central Fl.If you ever buy a complete power package from let's say HL,the Iradium plug comes with the air filter,muffler,jets etc.Try it out and you'll like them.
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