Testing coils off a bike

[KIC]

I have 4 coils on one of my parts bikes and would like to pull them and keep them in case somebody needs them.

 

Is there a way/procedure to test and check them off the bike or on the none running bike ?

[gibvel]

V7Goose was in the process of testing coils. He had asked for people to send them their supposed "Bad" coils to see if he could check resistances and make some determinations.

 

I don't know if he had/has a test procedure for testing them or not. May want to shoot him a PM if he doesn't get to this post.

[Cougar]

Think he wanted bad ones from the 2nd gens tho.

its in a sticky on the 2nd gen tech

[gibvel]

Yeah, you're right. Wonder how closely they resemble each other though. If the principle is the same the procedure may be the same between the two. Just a thought.

[Cougar]

right, and goose has the stuff to test them , should be pretty close I bet.

'he will chime in here in a bit tho I bet :-)

[mm482]

You can measure the resistances with a good ohms meter. The primary winding should have 2.7 ohms + or – 10% at 68 * F. The secondary winding resistances should be 13.2K ohms + or – 20% at 68*.

Earl

[MikeWa]

It is fairly easy to check resistance and if that fails the coil is bad. BUT and this is a big but there is a big difference between the 1/4 volt used by the DVOM to test resistance and the 20,000 volts produced in the coil. In other words the coil could be arching internally and the resistance test would just plain miss it. There are testers that can plug into a coil and make them spark while testing their output. These are generally the most accurate,,, and expensive.

 

Mike