Honda CB350 CL350 [116/219] Ignition circuit 105

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5 3 IGNITION CIRCUIT 3 Spark plug thermal characteristics The thermal characteristics of the plug are the most important factor of the spark plug operating efficiency Suitability of the spark plug for an engine is based on its thermal characteristics a Ideal condition for plug performance The tip of the spark plug extended into the cylinder head is constantly exposed to contamination by the carbon produced as a product of fuel combustion and also to the oil entering the combustion chamber These foreign matters are electrical con ductor and when it forms on the electrodes a short circuit path for the high voltage is produced As a result the ignition spark becomes deteriorated causing engine to misfire resulting in loss of power and in extreme case the engine becomes inoperative In order to prevent this condition the insulator firing area must be maintained at a temperature which will burn off the carbon This temperature will vary with different type engine riding condition and type fuel used but it is generally between 450 C and 600 C 842 F and 1 1 12 F This temperature is referred to as the self cleaning temperature If this temperature is too high the insulator firing area will become overheated igniting the fuel mixture and causing a phenomena called pre ignition This will cause loss of power in the engine therefore the insulator firing area should be held below 800 C 1 472 F with some degree of variance for different type engine to prevent pre ignition In other words the firing area of the insulator should be neither too cold nor too hot Fig 5 16 Satisfactory condition Fig 5 17 Excessively burnt condition Fig 5 18 Sooty condition dry Fig 5 19 Sooty condition wet 105

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