Yamaha YZ250(W)/W1 Owner's Service Manual page 518

IGNITION SYSTEM
EC62B000
SPARK PLUG CAP INSPECTION
1.Inspect:
9 Spark plug cap
Loose connection ¡ Tighten.
Deteriorated/Damaged ¡ Replace.
9 Spark plug cap resistance
Out of specification ¡ Replace.
Tester (+) lead ¡Spark plug lead terminal 1
Tester (–) lead ¡Spark plug terminal 2
Spark plug cap
resistance
4~6kΩ at
20°C (68°F)
EC627011
CDI MAGNETO INSPECTION
1. Inspect:
9 Pick-up coil resistance
Out of specification ¡ Replace.
Tester (+) lead ¡White/ Red lead 1
Tester (–) lead ¡White/ Blue lead 2
Pick–up coil
resistance
248~372Ω at
20°C (68°F)
2. Inspect:
9 Source coil 1 resistance
Out of specification ¡ Replace.
Tester (+) lead ¡Black/ Red lead 1
Tester (–) lead ¡Black lead 2
Source coil 1
resistance
720~1,080Ω at
20°C (68°F)
6-5
ELEC
Tester selector
position
kΩ × 1
Tester selector
position
Ω × 100
Tester selector
position
Ω × 100