About 9 years ago I bought a new 5220 Cub Cadet chainsaw thinking cub was a fairly good brand. I used it all the time and blew a piston and replaced it with new rings and its to the point now where half the paint is gone off the body Ive worked it so much. I bought a new carburetor and put that on and it seemed to run pretty good but not like it did when it was newer. A guy at the parts store asked if I ever used the new to me E-3 sparkplugs and I said no. Cub had one of the big chainsaw companies make this model for them, their an Itialian saw company known as EMeck and from what I was told they make a lot of saws for different companies and are one of the big boys.
So I put in a new E-3 plug and it started right up and it also made it easier to adjust the high and low speed gas screws. Before I started it I put the plug in the sparkplug boot and pulled the starter rope and the spark was noticeably bluer, the bluer the spark the better it runs.
I then tried to start my log splitter with Champion plugs in it and the right temperature plug and beings its so cold blooded it didn’t start. So I went and bought 2 new E-3 plugs, one for each cylinder, hit it with a little ether and hit the ignition and it fired right up and ran like a champ.
These plugs are about twice as much as an NGK or AC plug but they work. NGKs were through trial and error over the years, were my go to plug but with the results of the new E-3’s I’m putting them in all my gas engines, Including both my motors for my jon boat. Anyone ever tried them and if so what were your results.