Hello all,
Just an update on my engine... I called Kangke Industrial USA about my SK .90 and talked to their tech. He told me pretty much what all you guys are telling me that you difinitely don't want to over tighten the prop nut. He also recommended running wood props compared to plastic props. He told me that they would repair my engine under warranty.


Thanks to all who replied to my post! It was all very helpful!