I think my carb is bad ( WT414) I tried every tuning trick I could find and still can't get it to run in the air. It tunes great on the ground and as soon as it gets airborne the carb loads up and dies above half throttle. I put a rebuild kit in it and got the needle valve to finally seal, but it just refuses to run in the air. I've got another one I'm going to try to see if it is indeed the carb or maybe just my lack of tuning skills.