Dear Dave.

My YS 110 stops running well at high speed after been running good for months. It is not getting full rpms after some minutes on the air, it starts to run pretty irregular at high rpms. After re-fueling, it gets worst Should I re-adjust the regulator (little in)?. I saw a bit of oil after flying at the sealing of the piston /cranckcase , but not sure if it was the same before. Dont want to open and change the gasket before you tell me what you think. Thanks.