Just wanted to do a follow up with you guys on my Roma.

i replaced the rear bearing and the front, the rear bearing was definitely shot. Engine runs so much smoother now.
But...
One thing i have noticed now is that the piston head is tapping the button head, this came about when i fired up the engine and was hearing a pinging.

So from what i have gathered from reading
1.) no shims or not enough, All 3 stock ones are in place. is a solution to add one more?
2.) connecting rod has stretch and needs to be replaced? not sure how to check this.
3.) having the sleeve pinched fixes this?

Any help would be great.