I didnt put it back together to test the compression Grumpy.
Yes, I couldnt feel any scratches with my fingernail.

I have measured the piston at 61mm approx, across the crown.
Is this a 160cc motor then?
If so then I will have to edit the text in all the posts smile

I have purchased 2 sets of rings (125cc & 160cc)
each kit has a grey,black & wavey coiled up ring. Im not sure why they are different colours and what the wavey one is for.
To date, I have struggled to tell the difference between the 2 sized motors.

Happy is he who penetrates the mystery of things.