Update:

This zilla's top end is pretty milked out. Suppose to be the original stock bore. It runs well and starts easy. I am almost afraid to tear it apart. I am also afraid of this piston or thrust washer grenading and causing a bigger mess!!

Anyway - I bought a small reed top end of PCS. I sent it to HPR today for a bore, squish, and o-ring job. Why I didn't send the 87 jug on it, I can't answer that. I feel like its wrong to put this small reed top end on a 87 but it goes with the theme of this quad. Stock "torquey" reliable play/trail quad.