Honda CB350 CL350 [113/219] 5 electrical parts

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102 5 ELECTRICAL PARTS A simple condenser test can be performed during the insulation resistance test with the megger Remove the condenser from the megger and contact the lead terminal with the condenser metal case If a good strong spark is produced the condenser can be considered in satisfactory condition It is unlikely that the capacitance value of the condenser will change With the use of the service tester an accurate measurement can be made of the capacity and resistance value Refer to the section 5 9 Service Tester C4 F Spark Plug Spark plug performs one of the most important functions of the engine ignition system The high voltage produced by the ignition coil is routed through the high tension lead to the spark plug and causes the current to discharge across the center electrode to the side electrodes in a form of a spark within the combustion chamber of the engine This spark ignites the compressed fuel mixture which produces the energy to operate the engine Since it must perform under different adverse conditions durability and reliability are primary requirements The Honda 250 350 uses the spark plug type NGK B 8ES 1 Spark plug requirements In order for the spark plug to perform satis factorily it must fulfill the following conditions a Electrical insulation Electrical current follows the path of least resistance and therefore it is constantly seeking a path having less than that of having to jump across the spark plug gap The resistance of the insulator under normal temperature is high but it deterio rates with increases in temperature there fore the insulator must be made of material that does not change with the temperature b Mechanical property The pressure within the cylinder during combustion is from 35 to 45 kg cm2 If the spark plug is inadequately sealed the pressure will leak through the spark plug and also causing the plug to heat up resulting in loss in efficiency The spark plug must possess superior mechanical properties so that it is able to withstand high temperature and pressure as well as vibration and shock

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