Topic: resistor spark plugs in lawn equipment

[dave500]

I dont use resistor plugs in my old car or honda but lots of lawn/garden equipment use them in place of resistor caps,its to do with keeping rf interference from the electronic ignition modules and radio and tv,Ive never had trouble with resistor plugs in chainsaws etc until today,I had found in my job as a dumpster bin driver a nice looking Honda blower HHB 25,it needed a primer bulb and fuel line and air filter was disintergrated glug,so i got new filter etc and it ran fine for few minutes then bogged flat spot and letting up on the throttle it came back over and over,seeing Id had the carb apart for the primer bulb I did another strip and blow clean,and same dead spot,pulled the ngk plug still hot and had resistance from the terminal to the body!when it got cold it went away!,fitted a used torch brand I had and the machine runs fine,sold it 90 bucks,Ive always said on this forum to square away your ignition before you pull carbs over and again,I got bit!!

[Don R]

  I have a similar problem with a Poulan chain saw. It needed the usual filter/primer bulb /fuel line change and tank flush, now it runs for a bit and dies. I'll check to see if I did a plug swap already.

[HondaMan]

I'm luckier: my chain saw is REAL old (like from when I was a kid!), and it uses non-resistor plugs.
Since I only use it when gathering firewood up in the mountains, no one complains about its RFI, either.

[CycleRanger]

Hmm, that is interesting. I need to check the plug in my Husqvarna weed eater as it exhibits a similar problem. Never occurred to me that it could be the plug.