Honda CB350 CL350 [115/219] Electrical parts 104

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104 5 ELECTRICAL PARTS a Electrode The material of which the electrode is made should be one that is highly resistant to wear possess low discharge voltage high heat conductivity acid resistance and must be a good electrical conductor further it must be readily workable Nickle alloy and metal having high heat and corrosion resistance is used Fig 5 14 b Insulator D Special nickel alloy material Copper wire material 3 Iron wire material Fig 5 14 Electrode construction The insulation is usually made of high quality alumina Since voltage of 6 to 1 5 KV is applied to the electrode and ex posed to temperature exceeding 2000 C the insulator must be able to withstand these conditions The chief benefits derived from using this type insulator are 1 The insulating property under high temperature condition is superior and the possibility of flashover is reduced due to the ribs formed on the head of the insulator body Misfire of the ignition under high speed and loaded condition is eliminated 2 Due to its good heat conducting property the heat of the plug is rapidly dissipated preventing any overheated condition 3 Its high resistance to thermal shock prevents damages to it from sudden heating and cooling c Powder Filter J High quality alumina 1 Corrugation flashover prevention 5 15 Insulator construction Different types of powder filler are used to form a seal between the insulator and the center electrode as well as between the insulator and the metal shell The heat of the center electrode is uniformly dissipated to provide a product having a uniform quality heat range A special alloy having a high heat resistant value is used for the center electrode to minimize the wear and meet the high compression pressure of the engine Further a large center electrode is used for rapid heat dissipation and also to reduce wear

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