Yamaha Motor Co., Ltd. YFM7FGPW — CHARGING SYSTEM

EBS01066 EBS01100 Is the charging voltage within specifica- tion? Replace the crank- shaft position sensor/ stator assembly. NO YES The charging circuit is OK. 5. Wiring Check the entire charging system’s wiring. Refer to “CIRCUIT DIAGRAM”. Is the charging system’s wiring properly connected and without defects? YES NO Replace the rectifier/ regulator. Properly connect or repair the charging system’s wiring. 9 - 29 CHARGING SYSTEM ELEC – + ELEC – + 3. Charging voltage 4. Stator coil resistance • Connect the engine tachometer to the spark plug lead. • Connect the pocket tester (DC 20 V) to the battery as shown. • Disconnect the AC magneto coupler from the wire harness.

• Connect the pocket tester (Ω × 1) to the stator coils. Positive tester probe → positive battery terminal 1 Negative tester probe → negative battery terminal 2 Positive tester probe → white terminal 1 Negative tester probe → white terminal 2 Positive tester probe → white terminal 1 Negative tester probe → white terminal 3 Positive tester probe → white terminal 2 Negative tester probe → white terminal 3 W W W 1 2 3 • Start the engine and let it run at approxi- mately 1,000 r/min. • Measure the charging voltage. • Measure the stator coil resistance. Charging voltage 14 V at 5,000 r/min NOTE: _M ake sure the battery is fully charged. YES NO W W W