Just seems unusual that it would seize out of the blue without hearing something catastrophic like a piston or conrod breaking or observing over heating cook smoke to me. 2h is a very tough engine. Some reason or major sign for it to seize. They can sit a long time without being used without...
whilst the 4bt is a good engine, it seems a bit premature to throw out the 2h without further investigation. ?The 2h is a reliable engine. When did you last start it?
once the same happened to me when I had a small hole in the soft fuel line from sedimenter to fuel pump. I had a spare hose, reprimed and it is good since...maybe?
The starter solenoid throws me off too, hard to tell what the pvo did. Have to look for everything which leads to your starter. In bay and cab. If that thing is the replacement, you may want to try an ome relay too.
The little big box pic you have is the external reg, nothing to do with...
yeah, that is the weird thing, cutting out whilst running, which makes you think edic. But then the starter not kicking over means perhaps the edic is still switched off when trying to start again. Does it start up again after a period of waiting? Bad electrical connections can be erratic...
Maybe fuel edic or electrical ground I am guessing. Can be a problem when not used frequently.
Seeming it started but you could not restart it, makes you think fuel. Any little soft fuel hose leaks? Sedimentor?
Does the starter crank at all? If not, electrical. Could be starter relay...