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Stihl MS 461 cyl plug threads damaged

Lone Wolf

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Wolfie, how did the plug threads get messed up? Any idea? I've never had any problems with the plug threads in my 046 Mag. Just curious. o_O
It came to me this way. I suppose someone stripped it and tried to Heli coil it and failed.
 

Wood Doctor

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That sounds right. Probably used a half-inch socket drive and applied too much torque. I've never stripped one on a chain saw but another possibility might be a cross-thread. I ran into this on a 4-cycle engine. I eventually was able to carefully rethread it with a fresh plug. Not easy, but occasionally it can be done.
 
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