Need Help. I have a RCGF 50cc engine. Idels great, transitions great, but leans out at full throttle after 20-30 seconds. I have richened the HS needle from 1.5 to 3 turns out and it had no effect. I have replumed the tank fittings and lines to a bigger ID. I have put a brand new WT 201 carb on it. (It had a Chinese Walbro copy) Anyone got any ideas? It's a reed valve engine. I have done all I know to.

Thanks
Doug