ok, i'll let my engine rest in peace[&o]
actually, i checked the bearing, its intact, no loose needles. what probably is the cause? does a propeller not balanced properly caused this? but if so, why did it happen when it was running at low revs and i was just checking my new mounting. hmmmm. did inverting the engine caused this? because i run it at full throttle when it was upright with no problem.
prop nut, i dont think that is a spring, i think its parts of the cylinder wall that had been scraped when the piston chipped.
thankS!!!