OK... know I understand the question better.

Never heard of the plane before.

I have some experience with GWS motors, but haven't heard of the designation S2. Not saying it's incorrect, I've only played with 100s and 300s by GWS.

Don't have the slightest hint why your motor cuts out on full L stick... sounds like possibly some sort of mixing thing in your transmitter????

What size battery are you using... cell count and mah? The motor not providing enough power could be a battery problem. It could also be a prop installed backwards. Are you using an orange GWS prop? The writing on the prop should be facing to the front of the plane.

Sierra Gold