Chain Saw ate plug

[chopped]

Yes it was the original and the electrode is gone , but you can see the small 'nub' where it was attached.I was a cold day when I was cutting, and I was cutting allot i was ON my third tankful pretty much straight out. I cut the wood to just under 12 inches so on a good size log its running quite steady.I can even notice that the oiler even set on full sometimes has a hard time keeping up.So isn't possible it was running hot and steady..
Question if it was running hot is this why the plug was loose? Never been a problem in all these years.
It had a new Champion plug now and was running OK. so time will tell I guess.Maybe it was a bum plug.. ??
Also I tested the plug with it outside the engine and it actually got a good spark even without the electrode. ..Even after the noise it still was running I manually shut it down. but then wouldnt restart.Possibly it was so hot it "dieseled" ??

 

[Dmace]

Good tips
this post has got me wondering. Maybe I should mix some new fuel myself..And see what others say about the diesel in it also..Is the idea the diesel would do the same as the stabil?

Adding a little diesel to gasoline for a 2-stroke mix is just the same as running a richer (more oil) mixture. It will help slightly with pre-detonation because of the added oil but will do NOTHING to offset the downfalls of Ethanol fuel like algae growth, deteriorating fuel lines, lean mixture, hotter engine temps, etc...

When the engine overheats or runs close to overheating, the head actually expands slightly and the threads for the plug can even expand slightly due to the difference in metal types. Between this and the vibration, the plug could easily back itself out some. Also, the plug will still spark outside the motor since it can ground to the threads of the spark plug itself but it will not spark under the high compression in a cylinder since it has to "arc" too far and the spark actually gets "blown out" by the high compression. It was still running due mostly to the momentum of the engine already spinning and you weren't still accelerating the engine.

 

[arrow]

This is exactly what happened. You are either running your saw too lean or your gas mix is old. I was standing next to a guy one day whose plug flew out of an almost 7 hp chainsaw and hit me right in the hard hat and almost knocked the helmet off. He had leaned out his chainsaw for speed enough to cause detonation and it came out like a cannon shot. Don't forget, it had to break loose from the wire after stripping out of its threads and still had quite abit of force. I never saw that happen again but I saw plenty of what happened to you. I never adjusted any of my saws to their screaming point. Just so they're 4 stroking is plenty if you are looking for saw longevity over production speed.

 

[easygo]

I also only mix up 1gal of fuel at the time. I buy the highest grade gas and add quality oil and some fuel stabilizing additive. You can find ethanol free stabilizers nowadays. I have done that since the saw was new about 5-6 years ago and no problems. Use the same stuff in all 2 stroke engines and no problems stating or running them even after several months of sitting.

Edit: I do add the stabilizer stuff to all small engines I have and have had no problems.