PlanZero
Proven Member
- 1,516
- 263
- Aug 13, 2013
-
Easton,
Pennsylvania
Looking at a possible beater. 420a. Owner said plug popped out 4 years ago. He put a save a thread insert on it. Recently it popped out again. He tried a new insert, and immediately started tapping. Took the plug out and electrode was bent. I'm assuming it's impossible for the piston to hit the plug, even if it was the wrong plug. I'm thinking a broken valve? He put a magnet in the hole and didn't find anything.