Stripped Spark Plug

[BuckthornBonnie]

I had a solid insert repair fail after 2-3 years of moderate firewood duty. Came back to me with running issues when hot, the insert backed out when checking it with a new plug.

Hopefully getting it welded up next.

 

[Lone Wolf]

I had a solid insert repair fail after 2-3 years of moderate firewood duty. Came back to me with running issues when hot, the insert backed out when checking it with a new plug.

Hopefully getting it welded up next.

Got a guy to do that?

 

[BuckthornBonnie]

Probably Shaun, yep. I figure it’s time to fix this right. 10mm 044, has cut a ton of wood.

 

[Wood Doctor]

I guess I am coming in on the back door of this thread, but I thought I would make a comment anyway. Stripped plug threads don't mean as much as you might think. Three years ago a guy stripped his plug threads on a Stihl MS440 and gave the engine to me for repair.

I took the same plug and tightened it back down as tight as I could with a socket wrench. Then I started the engine. It ran fine, even though the plug was not nested all the way down in the cylinder because the threads were stripped. In disbelief, I removed the plug, added a drop of two of oil to the plug's threads, and tightened it down again with the same wrench. It might have gone in a half turn further but still at an angle and not nested.

Once again, I started the engine and it ran fine. It runs today after three years and no complaints from the owner after a hundred or more hours or operation.

 

[Lone Wolf]

I guess I am coming in on the back door of this thread, but I thought I would make a comment anyway. Stripped plug threads don't mean as much as you might think. Three years ago a guy stripped his plug threads on a Stihl MS440 and gave the engine to me for repair.

I took the same plug and tightened it back down as tight as I could with a socket wrench. Then I started the engine. It ran fine, even though the plug was not nested all the way down in the cylinder because the threads were stripped. In disbelief, I removed the plug, added a drop of two of oil to the plug's threads, and tightened it down again with the same wrench. It might have gone in a half turn further but still at an angle and not nested.

Once again, I started the engine and it ran fine. It runs today after three years and no complaints from the owner after a hundred or more hours or operation.

Best not take that plug out it might cause a compression loss there. Leave well enough alone.

 

[PogoInTheWoods]

Why not fix the threads instead of hoping it would last just because the saw still ran with a cock-eyed threaded plug?

Forgive me for sounding a bit skeptical, but I'd hardly call that a "repair".