Bosch WSR 6F vs NGK BPMR7A

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I think I've seen some Champion plugs leak when subjected to pressure. Even with the crush washer totally flattened.

I remember as a very young lad, the plugs came with a copper washer. I learned at the time it was for heat transfer. Plug to cylinder.

Dead soft copper, supposed to be single use.

I bet they would seal.[emoji848]
 
I also remember the orange w/black lettering Dorman drawers every parts store seemed to have. Held a trove of fascinating gizmos.

“What’s this grandpa?”
“Freeze plug Carl.”
“Was it do grandpa?”
“Keeps the water in Carl.”

And on and on it went.

Sam Hassebrock had the patience of a saint.
 
Dealer says if Oregon plugs cause damage to your saw, Oregon will cover the cost.
 
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