Tried my fitrst YS engine today without succes.
It runs for 20-30 seconds right. Then pressure in the tank builds up and it starts running rich and stops.
At that time fuel is foamning and streaming out of the carb.
Turning the needles does not seem to help. The pump screw is 3 turns open and should not be touched according to the instructions.
What am I doing wrong?

It looks like this post:
http://www.rcuniverse.com/forum/YS63...1994419/tm.htm

But the lines are correct according to the instruction leaflet (fuel-line at the exhaust side)