I've bought resently my first heli (Ornith from Robbe) with a webra .40 engine. And I had some problems adjusting it. But I E-mailed Webra and they have send a manual (which wasn't incl. with my engine(?!)). The manual tells you how to set up the carb settings so that the engine will always start (this come's in handy if you are messing with the carb settings as I was). If you want the manual you can also mail me (it's a PDF and I don't know how to add it in this post).
Regards from Holland.