Snappa, good luck with that pump. I put one on an OS-1.60 and it was always too rich on the bottom end. Once I took the pump off the engine ran perfectly. I had it on a 3D plane where I thought the pump was needed, on a warbird it is not an issue.

For those that wonder how this plane will fly, you have to keep in mind that the wing loading is much higher than some other ARF's such as the Hanger 9 warbirds. The weight is not and issue, IF you don't crank it around like a sport plane. I have not got mine into the air yet (below zero and snow you know), but after quite a few CMP planes I have a good idea how it will fly.