Yamaha WR250F Owner's Service Manual

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Contents

7-5ELECTRIC STARTING SYSTEM4. Inspect:• Sealed portion of ignition coil "a"• Spark plug terminal pin "b"• Threaded portion of spark plug "c"Wear → Replace.CHECKING THE AC MAGNETO1. Inspect:• Pickup coil resistanceOut of specification → Replace.CHECKING THE NEUTRALSWITCH1. Inspect:• Neutral switch conductionNot conductive while it is in neutral →Replace.Conductive while it is engaged → Re-place.Set the tester selection position to"Ω × 1".CHECKING THE CDI UNITCheck all electrical components. If nofault is found, replace the CDI unit.Then check the electrical compo-nents again.ELECTRIC STARTINGSYSTEMSTARTING CIRCUIT CUT-OFFSYSTEM OPERATIONIf the main switch is set to "ON", thestarter motor can only operate if atleast one of the following conditions ismet:• The transmission is in neutral (theneutral switch is closed).• The clutch lever is pulled to the han-dlebar (the clutch switch is closed).The starting circuit cut-off relay pre-vents the starter motor from operatingwhen neither of these conditions hasbeen met. In this instance, the start-ing circuit cut-off relay is open so cur-rent cannot reach the starter motor.When at least one of the above con-ditions has been met the starting cir-cuit cut-off relay is closed and theengine can be started by pressing thestart switch.WHEN THE TRANSMISSION IS INNEUTRALWHEN THE CLUTCH LEVER ISPULLED TO THE HANDLEBAR1. Battery2. Main fuse3. Main switch4. Starting circuit cut-off relay5. Start switch6. Diode7. Clutch switch8. Neutral switch9. Starter relay10. Starter motorTester (+) lead → Red lead "1"Tester (-) lead → White lead "2"Pickup coilresistanceTester se-lector posi-tion248–372 Ωat 20 °C (68°F)Ω × 100Tester (+) lead → Sky blue lead"1"Tester (-) lead → Ground "2"ResultConductive (while gearis in neutral)