Honda CB125 CB160 (1972) [96/139] Necessity of spark plugs with different

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90 5 ELECTRICAL PARTS b Heat reduction The plug is heated by combustion due to rotation of the engine being transmitted as shown by arrow in Fig 5 35 By regulating the heat dissipated and heat transmitted from the combustion gas the ignition section maintains a certain constant tem perature Refer to Fig 3 35 Necessity of spark plugs with different 4 heat values Quantitative difference of heat received by plugs The quantity of heat the plug receives from the engine differs extensively due to engine type air cooled water cooled 2 cycle or 4 cycle engine design compression ratio combustion chamber profile or position of plug installation and operational status speed load difference of fuel rough or smooth road conditions such Hence varied different heat ratio dissipation of for efficient conditions several dissipation is performance types ratios termed of are Plug under plugs with required The heat value The heat value is determined by construction profile and dimentions The plug with a superior dissipation Fig 5 36 Sectional view of plug characteristics ratio is termed conversely IGNITION TOO EARLY DIRTY SMOOTH RUNNING the cold one type well for high heated temperatures without dissipating is termed Hot type for low temperatures Refer to Fig 5 36 In HOT TYPE SPARK PLUG Model CB 125 CB 160 a standard NGK D 8 H 12 mm plug is employed However selection LOW POWER HIGH POWER IGNITION TOO EARLY SMOOTH RUNNING of plugs with suitable heat values must be in accord ance with climatic conditions Refer to Fig 5 37 COLD TYPE SPARK PLUG Fig 5 37 Plug comparison by operation sfatusl When the plug gap is incorrect adjustment should Spark plug NGK 027z i Standard value Spark gap 0 7 mm Maintenance value Spark gap Below 0 5 mm 019 1 n Noovs 0 9 mm 035 When rising is intense D 6H is employed With rising tendency D 9H is employed Fig 5 38 be performed by striking the side electrode When adjustment cannot be obtained due to electrode wear the plug should be replaced Refer to Fig 5 38

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