Google "Incipient detonation" a "Rattle" is the next step that you can actually hear, by the time you've heard it it's been doing damage for a long ass time... :(
I could tell you but then I'd have to kill you :evil2:
(not because it's a secret though just cos I don't play well with others as Mike has pointed out)
"Cheaper" upgrade... still a single spring and it you break one revving the engine hard you lose the engine, if someone is serious about punishing a 7M I'd say good duals and light retainers are a must.
I'm guessing the "debris" was the ground strap bouncing around before escaping, something would have to have been HUGE to sit on the piston and hit the plug and snap off the ground, most times it will embed in the piston or at least leve a good imprint.
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