Re: Ignition coil replacements.

Posted by Matt Story on Sep 02, 2012; 2:51pm
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/Ignition-coil-replacements-tp462048p4028503.html

Reviving the dead here...

So, I suspect I have a stock coil or possibly a wire connection going bad '77 CB750F.  Timing chain, timing (points), valves and carb all set to the best of my capability.  I still am getting intermittent backfires from 1 & 4 at idle.  I intend to test the coil to verify the culprit.  Can someone point me to a test procedure?

If I wanted to run these automotive coils which I think run around .5ohm primary, could I get good results by placing a 4.5ohm, 50watt in series to each coil?  That would total the right primary resistance.  I don't know what effect it would have on the output.  Perhaps I could compromise to 3.5-4.0ohm resistors.  My concern here not to degrade the points too quickly.  If I were to upgrade to a Pamco or Dyna later I could either remove the resistors or change them to a lesser value.

Just thinking now, my best way out w/o spending alot is probably to pick up a used 1-4 coil....

Matt