Backfiring through the exhaust

[PTmowerMech]

Stop it with the inferior spark tools LOL.

Taryl made a video "showing" all us how a coil can show "visible sparking" with the inline Christmas light types. Would blink at low, med and high revs with the bulb type. Gap type showed spark at low revs, nothing at mid and high revs at all. Weak coil all the way.

Here is Taryl's video on spark testers. Explanation starts at 4:04 through 7:07. Fast forward to get to the point.

Thank you. Also @Auto Doc's @Forest#2 and the others for this imput. That explains what I'm missing.

Tester ordered.

 

[PTmowerMech]

Here is Taryl's video on spark testers. Explanation starts at 4:04 through 7:07. Fast forward to get to the point.

One thing I noticed about this engine with the bad coil....... It didn't backfire.

 

[wekjo]

Blow shop air backwards thru fuel line to clear any obstructions. Costs nothing. Fuel starvation can cause intermittent back fire