What is going on?

Can you get more light on the strap? Ring says little much oil, but not a big deal. Ceramic says it was dialed in on fuel at whatever rpm that was turning when you pulled. Shadow on the strap, so I can't tell if the heat is right. Looks right though, just don't know for sure because the shadow.


Have you checked how the gudgeon bearing is sitting on the piston pin? If it's gotten to hot, it could have swelled and the bearing is sticking, shortly before it explodes.

If you do take the piston off, take a pic of the bottom of it for me. It will tell me if you have been running it hot.
 
Check your fuel lines and make sure it's not getting pinched or bent too much. I had that issues once... fuel wasn't flowing properly.
That was the first thing I did. I'm gonna empty the tank. And see if anything is clogging the petcock valve.
 
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