What size piston do I need? Help

[PluckStrumRide]

Engine wouldn’t start after 2 miles on a very hot day while riding. I suspected the clutch, no change. Once I opened it up, the piston looked scoured and the cylinder wall as well.
I’ve never worked on the top end before and need to know what to get.

What piston is this? The diameter of the cylinder is 47mm

also: I run a stock chinadoll, dellorto copy carb, nice expansion chamber pipe. Mix 40:1

 

[Mossy]

It appears to be a low hole piston a new jug also from the looks... Measure the hole to verify if it's 25mm or 30 from the bottom... Lot of options out there

 

[Mossy]

These 'C' clips won't come loose like the 'G'