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Hello friends who knows these candles, they recommended them to me by a friend who says that it is a very good material when you think? NGK R0373A-9
 

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They will certainly work...correct heat range and thread....but why would you spend $70 + for a spark plug in a street bike?? The regular iridium CR9EI is just fine.

From NGK web site:

Racing Spark Plug
  • Type : RacingElectrode design : Engine tuning. Torturous racing conditions. Avoid problems due to extremes of temperature. Service Life ** FOR RACING ONLY ** NGK Racing spark plugs have been designed to withstand severe operating conditions, such as high combustion temperatures and increased pressures. Their superior performance has been proven in motorbike and car races in Japan and overseas, including Formula One, World Rally Championship and MotoGP.
 
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Bonjour oui vous avez raison, j'ai payé 22.14USD l'unité chez webike ce n'était pas cher c'est pourquoi acheter
 
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