I recently fixed one for a fellow who only put 17 miles on it before the crankshaft froze. I explained to the people at Cosmopolitan Motors wht happened and that the problem had to be quality control. They provided parts at cost even though this moped had been out of warranty for years.
After putting it back together it runs fine. The Kinetic TFR is a copy of the Vespa Ciao. It's a poor translation though. I'd take an old vespa any day. the plastic used on the Kinetic seemed brittle despite beng only 5 years old. My '79 Vespa Grande's plastic is still pliable.
The design is based on a known good one, but the carrying out as far as quality goes is the problem.
fix the bugs and you should be OK
Jim