I bought a second hand extra 260 with a g38 in it and I finally got it to run yesterday after a few issues. It idles fine and revs nicely up until half throttle, after half throttle it acts starved and dies. I am new to gas engines and have limited experience with glow engines. It would make sense that the high speed needle needs adjusting. Do i need to lean it out or richen it up??

Thanks,
Zach (the gas newbie!)