Yamaha YZ250N Owner's Service Manual

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Contents

6-2IGNITION SYSTEM ELECEC620000IGNITION SYSTEMEC621002INSPECTION STEPSUse the following steps for checking the possibility of the malfunctioning engine being attributable toignition system failure and for checking the spark plug which will not spark.*Clean or replacespark plug.Primary coilSecondary coilRepair or replace.SparkCheck entire ignitionsystem for connection.Spark gap testNo goodNo goodNo goodNo goodNo goodNo goodNo SparkCheck “ENGINE STOP”button.Pick-up coilSource coilCheck ignition coil.Check CDI magneto.Replace CDI unit.Replace.Replace.Replace.Replace.Replace.*marked: Only when the ignition checker is used.NOTE:9Remove the following parts before inspection.1) Seat2) Fuel tank9Use the following special tools in this inspection.Dynamic spark tester:YM-34487Ignition checker:90890-06754Pocket tester:YU-3112-C/90890-03112OKOKOKOK