Honda CB350 CL350 [117/219] Electrical parts 106

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106 5 ELECTRICAL PARTS b Heat dissipation The spark plug heated by the heat of combustion from the engine is dissipated by the path shown in Fig 5 20 The heat from the combustion must be equal to the heat dissipated by so doing the insulator firing area can be maintained at a constant temperature Fig 5 20 c Heat Range The temperature of the spark plug in the engine will differ largely with the condition such as the type of engine whether air or liquid cooled 2 or 4 cycle design compression ratio shape of the combustion chamber location of the spark plug etc operating condition speed load type fuel Hot type tor low temperature use Medium type for medium temperature use Cold type for high temperature use The spark plug must function satisfactorily under these varying conditions The rate of heat dissipation of the plug is called the heat range The heat range is determined by the shape construction dimension and the characteristics of the spark plug A plug which readily dissipates the heat and which is difficult to overheat is referred to as the cold type high temperature use and the plug which retains the heat and burns readily is referred to as the hot type low temperature use On engine operating with high temperature a plug which is difficult to overheat in other words the cold type is used and for engine operating with low operating temperature a hot type plug is used Fig 5 21 The Honda 250 350 uses NGK B 8 ES type 14 mm spark plugs Fig 5 21 Comparison of heat characteristics 4 park Plug Reach The reach of the spark plug refers to the length of the threaded section Plug should be selected which has the proper reach The following undesirable condition velop if plug of improper reach is used will de a Reach too long Fig 5 22 Reach 1 Carbon will be deposited on the exposed thread of the plug and cause damages to the threads in the spark plug hole during plug removal

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