I have a DA 50, but have refrained from posting as I have not run mine and have no comments to give which would be insightful. They would just be speculation. I do not think the problem is in the rings wearing in, but that is just me. I am NO engine expert so...

If I had it to do over again I would buy the DA as their reputation proceeds itself and I trustt hem to work it out. Knock on wood!!! Mine might not do it[&:]

There are guys on here who DO know a lot about gas engines and I want them to post things so that people like me can learn.
I am pretty good with glow engines, but gas engiens are a new realm to me. A different animal altogether. I know what one sounds like and acts like whe it is right

Scooter Ross