local here has a cracking case
full cvt cover
stock gy6 wheel no fatty
stock shock, so nothing rock hard
its just like everything made in china, no QC and completely random
you get lucky or you dont
did their case have the following relief cut out of it.
i suspect this is a known problem in Asia as my replacement taiwan case has a relief cut out in this area from the factory to get rid of the sharp angle. id recommend doing this yourself with a 3/16" drill bit
Also, I wonder about which castings people have. I know Achi was working with Taida to produce a b-case style that I think had much better casting than a stock 150 case. Also, I think all of the b-case style are more from a Taiwan style gy6 that had better casting as well. I'm curious what Brahda and Achi have and if anyone running a different style casting than the 157QMJ has had a failure.
Achi is running a Taida B case now. It is much thicker and better than a normal B case, but a normal B case with a 150 cc would still be better than a non B case. The main problem with any chinese product is a lack of quality control. So the reality is even if everyone runs right side swing arm, dual shocks, and case cover, there are going to be some failures. So you just have to do what you can and be as safe as you can. If you are that worried and still want to run gy6, contact Achi and pay the money for the quality case. The ceramic bore on his new case runs cooler too.