There are so many new dealers out there of Chinese 2-strokes that many people are having issues with quality. I came across this artical written by Jim Wilson interviewing Arlo Kraus on "Those cute little Chinse bike engines"  Have a read then post a comment
and drop by http://greenspinner.com

Here's the link http://bikerodnkustom3.homestead.com/ArloLKraus_Interview.html