all spark plugs are the same125 trimmer.wmv

This video shows that using the wrong spark plug can and will cause problems

[@brianb5779]

I know you dont respond to videos but still going to say thank you very much for the gold mine of info of your videos..

[@obfuscated3090]

That's the best demo of resistor vs non-resistor I've ever seen since the two stroke motorcycles I've worked on aren't as sensitive. Now I'll be trying it on my saws out of curiosity.

[@arthurdombroskie3083]

The test results are very interesting. I thought resistor plugs were designed to reduce RFI for automobiles equipped with radios and certain types of ignition control modules. A resistor plugs usually only adds 5-10 ohms of resistance. Looking back now, I see I answered my own question. Maybe the ignition system on that trimmer is sensitive to RFI. Thanks for the demonstration. Sometimes we overlook the basics when troubleshooting!

[@thomasgronek6469]

I posted a question about V=IR. If 5 to 10Ω is a plug's resistance, and 25,000 volts (that's a guess), is present before the resistor plug, then the final result would be significantly increased by the plug's resistance, (Do you think I'm on the right track) ?

[@icsp2]

More like 5kOhms + A Champion RCJ7Y goes from 6kOhm to 15kOhm

[@thomasgronek6469]

@@icsp2 Thank you for the info. So is there any reason that V = IR would not apply ? and if it does, we are increasing the voltage delivered to the combustion chamber, at which point the use of a resistor plug might be imperative, if the system is designed to use one.

[@thomasgronek6469]

Great video, thank you: Does this have to do with V=IR ?

[@56kelsta]

Had the same problem with the same weedwhackerchanged plug ran greatdrove me crazy