Knowledge of the spark plug

1, the functions and features of the spark plug The role of the spark plug ignition coil high-voltage pulse generated by the introduction of a combustion chamber, an ignition spark generated by the electrode mixture, combustion is completed. Spark plug type generally consists of three parts numbers or letters. Digital representation of the thread in front of the diameter, as the number 1, indicating that the thread Motorcycle spare parts diameter is 10mm, the middle letters of the spark plug is screwed into the length of the cylinder portion; last digit indicates the type of heat: 1,2,3-heat, 5,6 for medium-sized, seven more for cold type. Spark plug "gap" is the main work of the technical indicators, the gap is too large, high-voltage ignition coil and distributor hard to skip generated, resulting in difficulty starting the engine; if the gap is too small, it will lead to a weak spark, but easy to leakage occur. 2, inspection of the spark plug 1) Remove: the high pressure points on the line in order to remove the spark plug and put a mark in the original position to avoid installation dislocation. Note electric motorcycle motor beforehand to remove dust and debris at the spark plug hole in the demolition to prevent debris falling into the cylinder. Stuck with a spark plug when removing spark plug, turn the sleeve to remove it, and in turn lined up. 2) Check: spark plug electrodes normal gray color, such as black electrode burned along with coke, then there is a fault. Check the spark plug and the cylinder can be turned on, in contact with a central high-voltage spark plug terminal, then turn the ignition switch, observe the high-voltage arcing position. Position as arcing spark plug gap, then the role of a good spark plug, otherwise, it will take new ones. 3, the spark plug electrode gap adjustment Spark plug gap were different kinds of models, generally should be between 0.7 ~ 0.9mm, check the size of the gap, can spark plug or thin gauge sheet metal were. If the gap is too big, can handle screwdriver to gently tap the outer electrode to the gap normal; gap is too small, you can use pliers or a metal sheet is inserted electrodes pulled out.