my troubleshooting opinion,machining jargon
In response to the photos,I know it has been I.D.ed as a broken ring,I see skirt meltdown,or carbon,I know the build is fresh, so probably not carbon.My opinion would be the aluminum then the ring.The post said it was four-stroking in the cut,I usually richen my oil mixture as well as the jetting,but who am I?I am currently running a Bailey's kit in a Husky 394xp for about eight months with no problems,however it is not ported,its just an old work saw.I recently pulled the muffler on the husky and the piston shows very little wear,it actually looks new.I am confident enough that I recently ordered another for an 024.As for the Asian tools,which I also own and use,the first thing we do is clean the machine up, do the testing and lube that should have been done at the factory,then a slow trial run being ready to shut down the machine to minimize damage as you experienced with the fourty thousand dollar machine.No they don't compare with Germany or the old U.S. machines for that matter.Even after the bugs are worked out with an Asian machine,a different set of operations are developed and used to sneak up on tolerances rather than making one run and chance wasting an entire project and starting all over.