I have a YS 140 DZ fitted to my TF Mentor.
It replaced an OS 120 which was underpowerd for the model.
The engine runs fine on the ground with 16x10 prop, 20/20 fuel, but as soon as I take off the engine quits.
I use about 200 metres of runway before lifting of.
I have richened up the main needle and the pump but no different.
Any suggestions?
Darryl