Troy, I recently purchased a used ys 140l and am haing some problems with it. The engine holds a great 1750 or if I want 2000 rpm
idle and will run for what seems like forever. When I advance the throttle it transitions well but at full throttle it seems to lean out even
with the needle 4 turns open. I have an 18 x 6w APC prop on it, I have tried others but the same results. THe engine only seems to reach 6 to 7K for about 10 seconds and then it starts losing power then it cuts off. I am using 30% cp heli and I have several ys engines with no problems yet. Have you ever experienced this before?


Thanks
Jeff