I received a used WEBRA 4-40 engine and I'm trying to put it into operation. As far as I don't have any information about the setup of the carburator, I'm want to ask for help here. Do you know the correct setup of the nozzle needles? What is reason for the rear outlet (look at the foto)? The Webra engines have a rotary valve system, is it necesary to check the system for tolerances, and what are these tolerances?
The engines turns smoothly without any major resistance or noise.
I'm looking forward to get some answers.
Thank you and bye.