Honda CB350 CL350 [114/219] Ignition circuit 103

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5 3 IGNITION CIRCUIT c Heat conduction The combustion temperature of the fuel mixture exceeds 2 000 C 3 632 F within the cylinder and this heat must be dis sipated as rapidly as possible or the plug will overheat causing preignition as well as damaging the electrodes This will prevent effecient performance of the engine Spark plug must therefore be able to withstand rapid temperature changes and further must also be able to dissipate the heat pro duced by the combustion gas d Carbon deposit When carbon deposits build up around the insulator due to improper combustion part of the high voltage is lost and a poor spark is produced at the spark plug electrodes causing engine malfunction e Lead compound Tetraethyl lead is added to the gasoline as an antiknock additive Lead oxide is formed during combustion and adheres to the insulator of the spark plug This be comes an electrical conductor at high temperature and causes the partial loss of the high voltage current resulting in engine malfunction It is required that the insulator and the electrodes be free from being chemically affected under high tem perature condition 2 Spark Plug The constructibn of the spark plug most com monly used today is shown in cross section by Fig 5 13 Center electrode Wire packing Gasket 4 Plate packing Spark gaps Terminal Insulation with corrugation 8 Filled powder Bonding Hex nut Metallic main body Side electrode Length of thread reach Fig 5 13 Cross section of spark plug 103

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