Welcome to the forum..........A Zeimini is a brand name of manufacturer of a cagllari....Cags come either 1/2 fairing and is also known as a MT-A1 or full fairing cag also known as a MT-A2...
The bike could have either a 43cc or 49cc engine.........Take a sideshot picture of the head leftside and post it...Ill be able to tell
The engine in your bike will run good on 42:1 mixture with 93 octane fuel..
I have a few cags and did some mods to them.........Heres a couple threads too..The first one will help give you an idea on ow to liven them up a lil...
http://www.pocketbikeplanet.com/showthread.php?t=79905
http://www.pocketbikeplanet.com/showthread.php?t=60828