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Received my Zeta today and during assembly i broke the top ring
Awesome! In my infinite wisdom i decided to take one of the rings from my ebay motor (both 100cc) and broke that one too!! My fault both times, it is what it is. Before breaking the second ring, i decided to put the Zeta head on the evilbay motor and it didnt fit, the studs were not in the right location although visually both heads looked identical. Whats the deal with that? My hypothesis is the ebay motor is a 50cc bottom and if i remember right the Zeta is a 66cc bottom end. Correct me if im wrong.
I also noticed the piston rings for the Zeta were about 2 mm thick and the rings for ebay motor was 1.5 mm thick. How would i go about finding a new top ring for the ebay motor? Im sure i can find a ring easily on bicycle-engines for the Zeta but not so sure for the ebay motor. The pistons are identical in width but not sure if the grooves are the same. Anyone got some pointers for me? Terribly disappointed the Zeta got here so fast and cant even rip it around!

I also noticed the piston rings for the Zeta were about 2 mm thick and the rings for ebay motor was 1.5 mm thick. How would i go about finding a new top ring for the ebay motor? Im sure i can find a ring easily on bicycle-engines for the Zeta but not so sure for the ebay motor. The pistons are identical in width but not sure if the grooves are the same. Anyone got some pointers for me? Terribly disappointed the Zeta got here so fast and cant even rip it around!