Murray Model 621500x4NA - what should the spark plug read for testing?

[netrate]

I am using a multi-meter to determine if my sparkplug is not working on my Murray snow-blower. I cleaned the carb last year and it worked fine. However, this year when I pull and even when I use the Electric Starter, I cannot get it to work. Spark plug testing : from the videos I watched, it looks like the reading should be between 6-7 (20K setting on the multimeter). However, they are using a different spark plug in the video than I have, so I have no idea if this reading is uniform throughout all sparkplugs. The sparkplug I have is a Champion CJ6 sparkplug. Right now, when I get a reading, it is about 3.15. I am new to this, so I apologize if I have said something in error here. If clarification is needed, please ask.

 

[Rivets]

I’ve been working on engines for over 50 years and have never heard of an accurate way to test spark plugs with a multimeter. If I think a plug might be bad I just change it.

 

[Douglas Lee]

Try the questionable spark plug in a known good engine, push lawnmower, or the like. . .
Thanks
Doug Lee
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[netrate]

New sparkplug didn't help, I am going to clean the carb next.