Thank you for all the feedback. Well noted. Here are some small update.
I should have some pics soon. We took off the gy6 and so far looks good so not sure why it wasn't running. I didn't see any out of roundness. I still have my machinist tools (mitutoyo calipers, i.d mics, etc.)
Here some measurements,
Block Sleeves I.d: 57.4 mm
Block Sleeves O.d: 62 mm
Case opening: 6.2.8 mm
Intake Valve: 27.8 mm
Exhaust Valve: 22.8 mm
Cam, heads, block all seem good. The muffler is badly rusted and I did notice the piston had slight discoloration on the skirt. Middle ring seem stuck and the top and bottom rings moved freely.
I probably just order a ring, carb and gasket kit.
Next is open up and have a look at the CVT. I like the ram air system it has so I want to try and modify the box. Modifying the stock bracket to add some Summit seats shouldn't be hard. Modifying the gas/brake pedals so my son can reach probably be harder.
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