Thanks for the tips, what is for one a stupid question is for another intelligent, so dont worry!

I have tried a whole host of different needle valve settings and nothing seems to do the trick. The model is a Charly from the company WIK in Germany (now extron www.extron.net) , and has a Webra 7,5ccm motor. The silencer tube is looking a little suspect to me, there is a big dent in it and the outlet pipe can move back and forth freely inside the outer aluminium tube (dont know if thats normal, not got enough experience). If I take off the silicon tube from the silencer which acts as the pressure feed for the fuel flow and blow into this with the inlet tube for the carb crimped there are no leaks. If i uncrimp the carb inlet then the air flows freely!!

If anyone could be so kind as to help me with some more suggestions, please send me an Email under [email protected] and I will take some pics this evening and send them.

Many thanks guys from the austrian alps!
Englischdude