1986-1989 Honda TRX250 FourTrax 250R Service Manual, Page 204Get this manual
ELECTRICAL SYSTEM
IGNITION COIL
INSPECTION
Measure the primary coil resistance between the black and green terminals
STANDARD: 0.1 -0.30 (20 C68 F)
Measure the secondary coil resistance with spark plug cap in place
STANDARD: 7-11 k!l (20 C68 F)
If the resistance is out of the specification, remove the spark plug cap from the spark plug wire and measure the secondary coil resistance without the spark plug cap
STANDARD: 3-5 kO (20C68 F)
EXCITER COIL
INSPECTION
NOTE It is not necessary to remove the stator coil to make this test
Disconnect the alternator blackred wire connector
After '88: