skysfallin - i was actually going to cut the firewall... but now my brother offer to buy the plane from me. He has an engine (not a DLE30) that will fit with out mod to the box. I'm just going to wait for the shipment from Chief and hope they are the newer version. Thanks for your help... and i do agree about adjustment to engine once you have them running well... i have a 50cc that didn't have to tinker with with needle after it was tuned correctly.