Hi,
Round huh?
That’s interesting that you don’t have some bore wear in an oval fashion since the bore is .007 over the piston diameter. That’s quite a bit.
Have you heard this engine run before the tear down?
If so, was there piston slap noise when warming up? Did it clack or did you find rod bearings wiped?

The excessive clearance got there somehow? What’s is the estimated mileage on this engine or rebuild before?
If it’s so round, maybe it was over bored and the crosshatch hone was done too lightly and the engines rings didn’t wear-in properly, since you said it was using oil?
Of course, this back ups that engine was done before, in the same way that you are proposing?

Man makes history, since he the only one that records it, so repeating it, is back on us!
Machineman

If the original and properly fitted pistons are here, Was there a ridge at the top on the cylinder showing up? I’m curious!
There should be a step up top where the rings don’t run in the bore.
With .0035 per side wear should have removed all of the original crosshatch pattern. How was that? What type or grade of rings are you considering for that scuff in period?
The Swedish know their metals and Swiss are proud with their precision work in their days of laborious craftsman. Just something to think about or not?

When you say you are going to hone and re-ring, you are going to need a crosshatch pattern or at least break the other glaze! That shouldn’t take much honing, but remember, you don’t have a whole lot more material to work with.
I suggest that because it’s so round and not tapered top to bottom!
You had better use a “flex hone brush” to acquire that. It has balls of abrasive on wires.
BRM invented these during my working days and these guys know finish honing!

If the pistons are round, knurling can a raise pad area up and help hold oil in the area to add support to the piston skirts. This area at the bottom of the piston is its bearing support for the upper rod end.
Between this area on the piston wall and riding on the rings it keeps things aligned in their holes.

Story ...
Back in my “really” young days it was a joke to say, “Oh-oh! He’s wound that engine up until you can hear the pistons switching holes.” Rev limiters were the ignition points bouncing! Nah! Kidding!
The engine would actually pop and miss fire around the dirt track!

At first, when I heard that statement I tried to imagine that happening?
I eventually figure out these “grownups” were getting my goat!
It’s called “ Valve Floating or unburned fuel out jumping out those straight up pipes!

Anyway good luck and I sure hope this rework, works out for you!
(:-)

Phil