I an new to ys engines. I bench ran my 120nc that other day and after I had ran it and it had set for a little while fuel started to completly fill the carb barrel. I asume that this is from the pressurized fuel system? Is this normal if you dont take the pressure off after you run one? Also what is the best way to refuel one of these devils with a cowl installed?
Thanks
Jeff

Fuel dots....one on each side. They will be fastened through the cowling.
Remember to relieve the fuel pressure after each flight.

FBD.

Not normal Jeff. Or I should say normal if something is wrong. The pressure regulator screw is to far out, or there is some contamination in the regulator holding the valve open, or your one way valve in the return line to the tank has become 2 way because of some obstruction or diaphram failure.

1 screw in the rgulator about a 1/4 turn
2 check 1 way valve
3 take apart and clean regulator

Denis

Go to this site for excellent info on YS engines/tuning:

http://www.geistware.com/rcmodeling/...er/ys_main.htm