I also notice that the ring land between rings on cylinder 2 was cracked in a section and broke off when i tried to move it. Could this motor have been over-revved as cause of its demise? I dont see alot of carbon on ring grooves or pistons crowns. No sign of detonation either. For the short time I ran it in 2019, when I checked the plugs (multiple times) it was rich appearing if anything. I cleaned high speed jet in spring when I first bought, but nothing looked amiss.