Motorcycle Repair: cb400n 1981, yellow wires, generator test

Question
how to check cdi and coil to make sure they are working

Answer
Richard... Here are some notes that I have given out previously to 400-450 owners... taken from a CB450T manual.

Pulse generator test 50-170 ohms Blue/yellow to Green wires

Alternator charging coil measure between all three yellow wires .6 to 1.1 ohms between leads

Ignition coil primary windings .1 to .3 ohms Rebel 450 .55 to .65 ohms all others.

Ignition coil secondary windings 7,200 to 8,800 ohms Rebel 450, 7,400 to 11,100 ohms all others

If the above tests are within range, then the CDI module is probably dying/dead.

Bill Silver