Hi Casey

You got the point fast!

Cheers, and stay safe.
VP

Without knowing what the LR1 governor is like, Id also suggest looking at the governor.

My CS roid was doing the same thing and watching how it worked, I could see a spot where it was grabbing and wasn't moving freely all the way though it's travel. I bent it  to adjust it and got it running fine.
About a week after I did it I came across a vid on YT explaining how to do exactly what I worked out.  Clearly a common Problem.

Just look at the angles and travel of the governor if it's the spring compensated type and check the motion of it.  If there is any snatch points.

Also I seem to remember some people put a 2nd spring on the opposite side to stop the hunting and provide more resistance on some Governors.
I know on a lot of small engines there are 2 Springs that run parallel. The second finer one is just to take the slack and movement out of the main spring. I have a Mower I use for dragging things round the yard that has that spring missing.  The thing hunts like Buggery at low revs but is fine up top.

Might pay to search YT for your problem and see what comes up.

Well done on getting it running again. The first thing I would look at is the governor to sort out the "hunting" on the revs.

Got to admit I am pretty worried about this. Been looking at some vids from qualified and experienced Doctors on this and whom the most suseptable are NOT to make it.
That's me.
My complications make my odds of getting though it even if there is all the care I need available... which there is a good chance there won't be. Then again, they say only the good die young so being the bastard I am, I should be here till I'm 150.

If my father gets it, no chance in hell he'll pull through it.  He has asthma and has had Pneumonia before and it kicks the shit out of him.  He also has recently Diagnosed heart problems. The local butchershop hospital for the region are less than useless at the best of times.  He lives in a place where there are more probably over '70s than 60 or anyone else.  Told me yesterday that there had been cases in his town and the next.  That's what they know of so far of course let alone whom it has and will be passed onto.
Only 3 people in the world I really give a shit about or can hurt me now and he's one of them.

Never thought I was going to see old age but might be over even quicker than I assumed.  Few years back I wouldn't have cared if I lived or died, in fact I stacked the odds against my self many times but nothing ever happened even though I well set it up to so I figured I was meant to stay around.
 Now, I'd like to go a bit longer although I know if that happens there will still be so much more heartache and pain in store as there has been my whole cursed life.

Might be time to have a talk to the daughter if things come to the worst and write some notes.  Maybe if I do that I won't need them bit if I don't.....

Still, my early demise wouldn't  exactly break everyone's heart.
Always figured with a history of cancer on both sides of the family, that would be how I'd go. Already got a list of scores I'm going to settle big time in my final weeks if that happens. 

Hope I don't get cheated out of that last bit of satisfaction and I do get through this.
Wife and daughter will be OK if they get it but if they do, it will be game over for me. 

In automotive diesels I think cracked pistons tend to be from trauma?

For example, our Fonterra fleet experimented with LPG-fuelled diesel engines years ago - they went like the clappers but cracked pistons were the result

I wonder if having the injection timing substantially wrong could add "load" or "shock" to combustion forces?

Better-educated brains than mine will know