So here's a great video I just saw, about testing spark plugs. huh, testing spark plugs? Yup!
This guy's youtube channel is focused on small engines, chainsaws, mowers, etc. BUT- the info and easy techniques he shows are useful, for any gasoline engine. Yes, spark plugs can go or be bad, and not just from carbon fouling. Unseen internal flaws, like a bad resistor, or a hairline crack in the white ceramic insulator, can cause trouble.
I've harped for years on ignition, testing plug wires Ohms resistance, parts selection, etc. But watch this video, and gain some insights. Cheers!
Gadgetman Reno, NV
The following user(s) said Thank You: Michael Lee, Preston, Andrew Leyva