Yamaha TT-R50E 2005 Manuel D'atelier Du Proprietaire page 350

IGNITION SYSTEM
AC MAGNETO INSPECTION
1. Inspect:
R W
1
2
6 - 5
• Pickup coil resistance
Out of specification → Replace.
Tester (+) lead → Red lead 1
Tester (–) lead → White lead 2
Pickup coil
resistance
248 ~ 372 Ω at
20 °C (68 °F)
– +
ELEC
Tester selector
position
Ω × 100