Should I reuse this piston?

[RedFir Down]

Get some 600 grit in there, if you don't feel it catch and you don't see anything obvious it will be fine.

How do I get 600 grit in the ring land?
I usually break the old ring in half and square it off with the bench grinder and go about it that way.

 

[jakethesnake]

Agree with the run it crowd.

 

[andyshine77]

How do I get 600 grit in the ring land?
I usually break the old ring in half and square it off with the bench grinder and go about it that way.

Just fold it in half and clean buildup out, if there's a bad spout you'll notice. If the buildup is that bad I soak in solvent, you don't want to round anything off. I've used a ring to dig crud out, but that was on a super high hour piston.

 

[cuinrearview]

I fold some fine grit sandpaper over a scale to clean lands.

 

[Lightning Performance]

I use a broken ground ring like the OP and/or someone mentioned.

Looks like you started this thread based on caution but already had your game plan in mind