CR9EIA-9 or CR9EIA for my 2015 KLE650F. "MOM" says CR9EIA-9 plugs, but new kawasaki parts page on kawasaki official website says CR9EIA plugs. I believe CR9EIA-9 "-9" means pre gapped and plug and play. CR9EIA needs self gap. Correct me if i'm wrong. MOM says gap on my bike is gapped to 0.8 to 0.9, which CR9EIA-9 is gapped to 0.9, why they put CR9EIA on the offical website is a mystery and that is gapped at 0.7.
The first letter of the NGK spark plug code (in this case a “D”) indicates the thread size of the spark plug. There are three spark plug thread sizes currently being used in motorcycles and ATVs. “B” indicates a 14 mm x 1.25 pitch size, “D” indicates a 12 mm x 1.25 size and “C” indicates a 10 mm x 1.0 size. The letter “J” indicates a 12 mm x 1.25 size with two ground electrodes.
The “P” indicates a projected tip spark plug design that moves the spark deeper into the combustion chamber. The letter “K” in this location would indicate a 3/8″ hex (wrench) size.
Note; Do not use a projected tip spark plug where it is not called for as it could contact the piston and cause catastrophic engine damage.
The “R” indicates a resistor type spark plug. Resistor type spark plugs reduce the amount of radio frequency interference (rfi) that can cause ignition misfires and static on the radio, if so equipped. The letter “U” in this location would indicate a surface discharge gap (no ground electrode).
The first number (8 in this example) indicates the heat range of the spark plug, the higher the number the colder the heat range. Generally speaking, a colder heat range is used under high temperature conditions such as racing, while a hotter heat range is used under colder climate conditions. It is best to use the heat range specified by the manufacturer.
The letter “E” indicates the reach of the spark plug, that is, the length of the threads. There are two size reaches currently being used in motorcycles and ATVs. “H” indicates a 1/2″ reach, while “E” indicates a 3/4″ reach.
The letter “A” indicates some type of special feature. The letter “B” or “C” in this location indicates a spark plug designed for racing applications. The letter “G” indicates a fine wire nickel alloy center electrode. The letters “GV” indicate a gold palladium center electrode. The letters “IX” indicate an iridium center electrode. The letter “P” indicates a platinum center electrode. The letter “S” indicates a copper center core. The letter “V” indicates a fine wire gold palladium center electrode. The letter “Y” indicates a V-grooved center electrode.
The number after the – indicates the recommended spark plug gap in tenths of a millimeter. A -8 should be gapped to .8 mm or .032″, -9 should be gapped to .9 mm or .035″, -10 should be gapped to 1.0 mm or .040″ and -11 should be gapped to 1.1 mm or .044″. If there is no number at the end of the spark plug code, it should be gapped to .7 mm or .028″ unless specified differently by the vehicle manufacturer.
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Last edited by Crimson Apple; 03-12-2019 at 03:33 AM.