Pinging when warm

Paul W. said:

I have no idea what was done to the bike the past with regards to rebuilds.

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Paul W. said:

I timed it at 28 and it’s a fair bit better, but still pinging.

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Well 31 was bad and 28 is better?

You need information.
1. what is the RPM point and RPM range that it pings at.
Simultaneously:
2. What is amount of throttle opening at which it pings---to understand the cylinder pressure it pings at.

Paul W. said:

When I had it torn down, I did notice two stripped head studs.

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Please identify the pistons now that you have seen them.