Squirt (96) engine rebuilding

[Zeek]

About to start on my engine rebuild and have some questions which I'll ask on this thread.
This is what i have to work with

So I'm expecting to have to split the cases and see what happening in there.
I've had the barrel cleaned and the bore measures 50.32mm..It's in good shape and also has this stamping...which is?


So what clearance is required between piston and the bore?

[Zeek]

So it seems the Ace 100 uses same piston? Those that I've looked at have two rings, whereas the old old one from mine has one...Is that any issue?

[Bullfrog]

The DPO (Dreaded Previous Owner) installed a single ring piston to suit his purposes. The toaster tank Squirt came with the 2-ring piston.
Ed