120 decreasing rpm
I am trying to get a older 120 running for a buddy of mine. I just replaced the regulator parts today and it is idling well. I am assuming the pressure port coming out of the nose of the engine should be pressurized with fuel coming out of it. This engine is only getting pressurized air coming out of it. When I rev it up to full throttle it will go wide open fairly well but will slowly loose rpm and eventually almost die. He bought this engine in a ultimate knowing it had this problem. I also put in a new os #f plug and replaced the fuel lines and tank stopper. When I open the vent line it is pressurized. Any advise would be appreciated.
thanks
Jeff