Home › Forum › Ask A Member › How Important is OMC Ignition Timing? › Re: How Important is OMC Ignition Timing?
If you’re using a continuity light or buzz-box, there’s no discernible difference between 0 and 1 (zero and one) ohms – either state will illuminate the lamp or buzz the box.
Nonsense. Buzz boxes are used to set airplane magnetos so you can be assured it’ll work just fine on an outboard. The buzz box won’t make any noise until the moment the points open.
Totally different situation. Compare the wiring diagram for one of these OMC magnetos to that of your aircraft magneto, and you’ll quickly realize the difference. Also, look at the pics in Mumbles’ post, just above mine – the difference between open & closed points is only 0.7 ohms!
Your typical continuity tester will regard anything below a few ohms as a closed-circuit. One example, the continuity ‘beep’ on one of my meters has a 100 ohm threshold, IIRC. That would never work for one of these OMC mags.. it would just beep continuously. See the issue?
Legendre,
Just a thought, and don’t mean to be rude, but some of the guys on here have a lot of experience with this vintage of motor, and trouble shooting them. They have been doing this for a very long time, and it is what they know. I have learned, even when Im totally certain that Im right, Im usually wrong, when an experienced veteran of this hobby like Frank states differently to my belief at that time. 999 times out of a thousand times anyways! I think Frank was wrong once? Maybe not. 😉
Wayne has taught me a lot about this hobby as well, and sold me my first vintage motor.
You can most definitely set the ignition with Franks timing fixture, and a buzz box or light. I have done it hundreds of times as well, all with great success.
These guys are here to help us non mechanics learn!