Like it says i took a better look at my quad today an yes i figured the problem out, i will give you more details in like 5 minutes an also i will have pics for the how to section.
I hope you thoroughly check your lower end for any damage. The pics you posted look as if the bottom skirt of the piston broke off. The last thing you want is to miss a broken piece of the piston and rebuild it to have it show itself again and have to rebuild it all over........and all the little fragments were embed in the crank bearings and thats the primary reason why my motor was rebuilt