ys 110 problem
 

Hi guys, today I had a hard time starting this engine and after a few minutes of frustration decided to have a look at it. Found that the exhaust valve is moving up and down and staying wherever I put it. I thouht the spring is broken but after a closer look discovered that the whole sleve with the seat is moving up and down. This to my knowledge should be a compressed fit and firmly lodged in the head.
Is there anything I can do apart from sending it to retailer?