I was told it was timed and double checked, and no banging or popping when it ran on opposite mag.
Well, this Will be a warranty mystery that will go unsolved. Mag is fresh out of the box, so back in the box it goes. First suspected the key switch, but nope.
This isn’t my problem, but what bugs me about this is I have a horizon Tach too, and partly the reason for having it is to tell me when I have a mag that isn’t working, but in this case, there is no indication that it isn’t working. I never knew an issue like this could exist.
Was curious if anyone else had seen such a thing?
The p lead is connected to the primary circuit, so it will only sense the low voltage side, points, condenser, p lead, and primary side of the coil. It can’t sense anything on the secondary or high voltage side of the system, so the secondary coil could be open, the rotor bad, the plugs or plug wires bad.
In your case, most likely a bad coil, bad rotor, or assembled incorrectly.
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You need to do the basic troubleshooting here. Mag timing box will not tell you if the mag was installed incorrectly. Was the mag pinned correctly before initial install? Was it installed on the engine with #1 cylinder on compression stroke? Scenarios like these mean that the mag will fire away as normal but the spark will occur in the wrong cylinder or at the the exhaust stroke instead of compression stroke. And the tach will indicate normal function.
As stated above, you can set the mag on a bench and check for spark. Or just take it to a mag shop and have do a functions check. Verify this before just sending it back without knowing the root cause of the issue.
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My Pmags fire at both the compression and exhaust strokes without any misfiring. No 4th of July noises.This isn’t my bird to call the shots, and it is in the hands of experienced mechanics, so I would think this was done. I have seen a mag set 180 degrees, sounds like the 4th of July.
Is it possible to time out of phase and have perfect silence on the bad mag?
My Pmags fire at both the compression and exhaust strokes without any misfiring. No 4th of July noises.
Perhaps, but only if the good mag was shut off.True, mine do the same. But if they only fired on the exhaust stroke I’d bet there’d be some fireworks as the mixture ignited and traveled down the exhaust stack while still burning.