Combatpigg - the 63 is a great engine and the pump works like a charm. I've had no problems with it so far.

Razor - I agree that the Zen would be great plane if I could get my own act together... but one thing is clear, I think I'm going to pull the 63 off the Rambler and back into the Zen where it was suppose to go in the beginning... that thing does make a ton of power! The China .61 is not very responsive and often idles irregulary high for a while before winding down. However, as mentioned earlier in this thread, I will try to get the CG done first before I do anything else! But thanks for that info!