Chattering at 3K and hot sputtery death

[SSTKO81]

Just to clean this up... root cause of the problem ended up being spun bearings. -oil pressure would drop off and the. Engine would get hot and start detonating on one cylinder. Turns out the coupler was spun too..... so that was a chore!

 

[NHGuy]

Thank you for reporting back. It's so great to hear solutions. So many times we get silence.