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Ignition System

Ignition System. High Voltage Components . Objectives . Understand the parts and operation of spark plugs Understand the Kill Switch How to identify spark plugs . Spark Plug Wire And Spark Plug . Spark Plug Wire Used to transfer electricity from secondary winding to spark plug

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Ignition System

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  1. Ignition System High Voltage Components

  2. Objectives Understand the parts and operation of spark plugs Understand the Kill Switch How to identify spark plugs

  3. Spark Plug Wire And Spark Plug • Spark Plug Wire • Used to transfer electricity from secondary winding to spark plug • Spark Plug • The part that receives electricity and transfers it into a spark in the combustion chamber

  4. Spark Plug Construction • Terminal • Connects the Magneto to plug • Insulator • Ceramic covering to prevent leaked electricity • Electrode • Center of the sparkplug that transfers the electricity • Ground electrode • provides a gap for the spark to jump and allow combustion

  5. Flashover • When Electricity escapes the plug • Happens when the sparkplug is too wet or dirty • Electric current can jump from the terminal to the ground plug • The Distance that the ribs provide between the two prevents most flashover • Can caused a fouled spark plug

  6. Plug Operation • Electric enters the spark plug and goes down the terminal jumps to the ground terminal. • The plug only sparks when it comes in contact with the fuel mixture • Plug gaps • The smaller the gap the less voltage needed and vise versa • As a engine gets older it will build up oil and corrosion causing a higher voltage to spark

  7. Kill Switch • In order to stop an engine power must be removed • The best way to do this is remove the combustion • Kill switches are used to remove the spark • Small engines have the kill switch connected to the ground wire • When of there is no connection between the ground and magneto removing the complete circuit

  8. Plug Heat Range • Spark plugs can reach temperatures above 2,000o F • At high temp the end will glow red and ignite the mixture at the wrong time • Loss of Power • At low temp. Oil and residue will not burn off • Fouled Plug

  9. Plug Types • J Gap • Surface Gap • Retracted Gap • Plugs are coded by their size and type of gap and size of threads

  10. Safety Interlocks • Used to kill the equipment during unsafe conditions • On a riding lawnmower when the blade is on, getting of the mower will kill the engine • Releasing the handle form the walk behind • Kill switch and safety interlocks are the same in our engines

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